Composition and Methods for Stimulating Gastrointestinal Motility

ABSTRACT

The present invention relates to a method of treating a transient impairment of the motility of the gastrointestinal system resulting from postoperative ileus in a patient wherein said method includes the step of administering a therapeutically effective amount of a peptidyl analog of ghrelin to said patient.

This application is a continuation application of pending U.S. Ser. No. 13/046,324, filed Mar. 11, 2011, which is a continuation application of pending U.S. Ser. No. 11/992,780, filed Mar. 29, 2008, which is a United States national filing under 35 U.S.C. §371 of international (PCT) application No. PCT/US2006/038027, filed Sep. 28, 2006 and designating the US, which claims priority to U.S. provisional application No. 60/721,916, filed Sep. 29, 2005, each of which is herein incorporated by reference in its entirety.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention is directed to methods for stimulating the motility of the gastrointestinal system in a patient which comprises administering peptidyl analogs that possess agonistic ghrelin activity, a prodrug thereof, or a pharmaceutically acceptable salt of said analogs or said prodrug.

2. Description of the Related Art

Gastrointestinal (GI) motility is a coordinated neuromuscular process that transports nutrients through the digestive system (Scarpignato, C., Dig. Dis., (1997), 15:112), the impairment of which may result in a variety of ailments including gastroesophageal reflux disease (GERD), gastroparesis (e.g., diabetic and post-surgical), irritable bowel syndrome (IBS), constipation (e.g. that associated with the hypomotility phase of IBS), emesis (e.g., that caused by cancer chemotherapy agents), ileus and colonic pseudo-obstruction (U.S. Pat. No. 6,548,501; U.S. Patent Application No. 20040266989). These various complications of interrupted GI motility contribute significantly to the health care burdens of industrialized nations (U.S. Pat. No. 6,548,501; Feighner, S. D. et al., Science, (1999), 284:2184-8).

“Ileus” refers to the obstruction of the bowel or gut, especially the colon (see, e.g., Dorland's Illustrated Medical Dictionary, p. 816, 27th ed. (W.B. Saunders Company, Philadelphia 1988)). Generally, any trauma to the bowel resulting in the release of inflammatory mediators leading to activation of inhibitory neural reflexes will result in the onset of ileus. Ileus may be diagnosed by the disruption of the normal coordinated movements of the gut, resulting in failure of the propulsion of intestinal contents (Resnick, J., Am. J. of Gastroentero., (1997), 92:751; Resnick, J., Am. J. of Gastroentero., (1997), 92:934). Ileus should be distinguished from constipation, which refers to infrequent or difficulty in evacuating the feces (see, e.g., Dorland's Illustrated Medical Dictionary, p. 375, 27th ed. (W.B. Saunders Company, Philadelphia 1988)).

Ileus may be brought about by a variety of causes such as parturition; intestinal ischaemia; retroperitoneal haematoma; intraabdominal sepsis; intraperitoneal inflammation, e.g., acute appendicitis, choecystitis, pancreatitis; fractures of the spine; ureteric colic; thoracic lesions; basal pneumonia; rib fractures; myocardial infarction; and metabolic disturbances. Post-partum ileus is a common problem for women in the period following childbirth and is thought to be caused by fluctuations in natural opioid levels as a result of birthing stress. Patients having undergone procedures such as major abdominal surgery including laparotomy for abdominal abscess or small intestinal transplantation (SITx), chest, pelvic or orthopedic surgery, often suffer from a period of transient impairment of bowel function called post-surgical or post-operative ileus (referred to hereinafter as POI).

POI commonly occurs for 24 to 72 hours following surgery. In some instances, the bowel dysfunction may become quite severe, lasting for more than a week and affecting more than one portion of the GI tract (Livingston, E. H. et al., Digest. Dis. and Sci., (1990), 35:121). Gastrointestinal dysmotility associated with POI is generally most severe in the colon. POI is characterized by abdominal nausea, distension, vomiting, obstipation, inability to eat and cramps. POI not only delays the normal resumption of food intake after surgery and prolongs hospitalization, but also fosters postoperative complications, especially aspiration pneumonia.

The administration of opioid analgesics to a patient after surgery may often contribute to and/or exacerbate existing bowel dysfunction, thereby delaying recovery of normal bowel function. Since virtually all patients receive opioid analgesics, such as morphine or other narcotics for pain relief after surgery, particularly major surgery, current post-surgical pain treatment may actually slow recovery of normal bowel function, resulting in a delay in hospital discharge and increasing the cost of medical care.

Agents which act to affect gastrointestinal motility may also confer beneficial effects upon patients suffering from emesis. Emesis, or vomiting, is often preceded by retching and may be accompanied by dry heaves. Emesis may be caused by imbalances in the digestive tract, such as ileus, dyspepsia, or inflammation of the gastric wall, or by imbalances in the sensory system or brain, such as motion sickness, migraine or tumors. Emesis may be self-induced such as in anorexia or bulimia, and it may also occur in response to severe pain, emotional responses (e.g., to disagreeable sights or odors), or pregnancy. Emesis is a common complication following the administration of many medications, particularly anti-cancer treatments such as chemotherapy. Prolonged episodes or repetitive emesis may result in a variety of injuries to the organism, including dehydration and electrolyte imbalances (Quigley, E. M. et al., Gastroentero., (2001), 120:263-86).

Agents which act to affect gastrointestinal motility may also confer beneficial effects upon patients suffering from gastroparesis. Gastroparesis, also called delayed gastric emptying, is a disorder in which the nerves to the stomach are damaged or stop working and the stomach takes too long to empty its contents. For example, following damage to the vagus nerve, the nerve which controls the movement of food through the digestive tract, the muscles of the stomach and intestines do not work normally and the movement of food is slowed or stopped. High blood glucose causes chemical changes in nerves and damages the blood vessels that carry oxygen and nutrients to the nerves. If blood glucose levels remain high over a long period of time, as is often the case in diabetes, the vagus nerve can be damaged; gastroparesis often occurs in people with type 1 diabetes or type 2 diabetes (Murray, C. D. et al., Gut, (2005), 54:1693-8).

The traditional therapies for impaired GI motility, such as that of ileus, gastroparesis and emesis, are considered ineffective. Current therapies for treating ileus include functional stimulation of the intestinal tract, stool softeners, laxatives such as Dulcolax®, lubricants, intravenous hydration, nasogastric suction, prokinetic agents, early enteral feeding, and nasogastric decompression. Nasogastric intubation to decompress the stomach has also traditionally been used to treat ileus.

Traditional pharmaceuticals used to treat impaired GI motility, such as that of ileus, include drugs that act to increase colonic motility, such as Leu13-motilin and prostaglandin F2 alpha, and prokinetic agents, such as Cisapride®. PROPULSID®, which contains Cisapride® monohydrate, is an oral gastrointestinal agent (U.S. Pat. No. 4,962,115) indicated for the symptomatic treatment of adult patients with nocturnal heartburn due to gastroesophageal reflux disease. Other prokinetic agents include, for example, metoclopramide, domperidone, ondansetron, tropisetron, mosapride and itopride. Other treatments include administering adenosine-antagonizing pyrazolopyridine compounds (U.S. Pat. No. 6,214,843); pituitary adenylate cyclase activating peptide (PACAP) receptor antagonist in combination with a vasoactive intestinal peptide (VIP) receptor antagonist (U.S. Pat. No. 6,911,430); fedotozine (U.S. Pat. No. 5,362,756); neuropeptides (U.S. Pat. No. 5,929,035); and proteinase-activated receptor-2 antagonists (U.S. Pat. No. 5,929,035). In extreme cases, ileus has been treated with surgical intervention to unblock the colon.

These therapeutic regimens, however, suffer from numerous problems. For instance, PROPULSID® was recently removed from the market due to its potential to induce cardiac arrhythmias (U.S. Pat. No. 6,548,501). Adolor Corporation is presently in phase III clinical trials for a therapy to treat postoperative ileus using Alvimopan (Entereg®). Adolor's therapy, however, utilizes opioid receptor antagonists which merely block the side effects of opiate analgesics, rather than actually relieving the ileus condition. The phase III trials demonstrate marginal efficacy and minimal applicability for the treatment of ileus, particularly postoperative ileus.

Furthermore, these prior art methods for treatment of impaired GI motility lack specificity for different types of impairments, e.g., postoperative ileus or post-partum ileus. Also, these prior art methods offer no means for the prevention of impaired GI motility, such as that of ileus, gastroparesis and emesis. If impaired GI motility, such as that of ileus, gastroparesis and emesis, could be prevented or more effectively treated, hospital stays, recovery times, and medical costs would be significantly decreased with the additional benefit of minimizing patient discomfort.

Drugs which selectively target gut motility to correct gastrointestinal dysfunction caused by postoperative ileus would be ideal candidates for preventing and/or treating post-surgical and post-partum ileus. Such drugs would also be excellent candidates for the treatment of gastroparesis and/or emesis, particularly emesis associated with chemotherapies or other drug induced gastrointestinal dysfunction. Of those, drugs that do not interfere with the effects of opioid analgesics would be of special benefit in that they may be administered simultaneously with drugs for pain management with limited side effects.

Peptides affecting the release of growth hormone (GH) are now thought to exhibit gastrokinetic or “prokinetic” effects (U.S. Pat. No. 6,548,501; Peeters, T. L., J Physiol. Pharmacol., (2003), 54 (supp 4):95-103 and references therein; Trudel, L. et al, J. Physiol. Gastrointest. Liver Physiol., (2002), 282:G948-52). Such growth hormone-releasing peptides, or GHRPs, are also referred to as growth hormone secretagogues (GHS). Exemplary growth hormone-releasing peptides (GHRPs) believed to exhibit prokinetic effects include GHRP-1, GHRP-2 and ghrelin.

Ghrelin, a recently discovered orexigenic hormone, is produced as a preprophormone that is proteolytically processed to yield a peptide of the following sequence: H-Gly-Ser-Ser-Phe-Leu-Ser-Pro-Glu-His-Gln-Arg-Val-Gln-Gln-Arg-Lys-Glu-Ser-Lys-Lys-Pro-Pro-Ala-Lys-Leu-Gln-Pro-Arg-NH₂ (Kojima, M. et al., Nature, (1999), 402(6762):656-60; (SEQ ID NO:338)). Ghrelin is produced by epithelial cells lining the fundus of the stomach and functions to stimulate appetite; its levels increase prior to a meal and decrease thereafter.

Ghrelin powerfully stimulates GH secretion from the anterior pituitary gland, mainly at the hypothalamic level, through its interaction with growth hormone secretagogue receptor (GHS-R) both in animals and in humans (Ukkola, O. et al., 2002 Ann. Med., (2002), 34:102-8; (Kojima, M. et al., Nature, (1999), 402(6762):656-60).

The native structures of ghrelin from several mammalian and non-mammalian species are known (Kaiya, H. et al., J. of Biol. Chem., (2001), 276:40441-8 and International Patent Application PCT/JP00/04907 [WO 01/07475]). A core region present in ghrelin is responsible for observed activity at the GHS receptor. The core region comprises the four N-terminal amino acids wherein the serine in the third position is normally modified with n-octanoic acid. In addition to acylation by n-octanoic acid, native ghrelin may also be acylated with n-decanoic acid (Kaiya, H. et al., J. of Biol. Chem., (2001), 276:40441-8).

Prior to the discovery that ghrelin is a native ligand for the GHS receptor, it was known that GHRPs controlled the release of growth hormone from the pituitary somatotrops. The hexapeptide His-D-Trp-Ala-Trp-D-Phe-Lys-amide (GHRP-6; (SEQ ID NO:342)), was found to release growth hormone from the somatotrops in a dose-dependent manner in several species including man (Bowers, C. Y. et al., Endocrinology, (1984), 114(5):1537-45). Subsequent chemical studies on GHRP-6 led to the identification of other potent, synthetic GHSs such as GHRP-I, GHRP-2 and hexarelin (Cheng, K. et al., Endocrinology, (1989), 124(6):2791-8; Bowers, C. Y., Novel GH-Releasing Peptides, Molecular and Clinical Advances in Pituitary Disorders, Ed: Melmed, S., Endocrine Research and Education, Inc., Los Angeles, Calif., USA, (1993), 153-7; and Deghenghi, R. et al., Life Sci., (1994), 54(18):1321-8). The structures of these compounds are as shown:

GHRP-I (SEQ ID NO:  339) Ala-His-D-(2′)-Nal-Ala-Trp-D-Phe-Lys-NH₂; GHRP-2 (SEQ ID NO:  340) D-Ala-D-(2′)-Nal-Ala-Trp-D-Nal-Lys-NH₂; and Hexarelin (SEQ ID NO:  341) His-D-2-MeTrp-Ala-Trp-D-Phe-Lys-NH₂. GHRP-I, GHRP-2, GHRP-6, and hexarelin are classified as synthetic GHSs.

A number of recent studies have demonstrated the potential use of GHSs such as ghrelin, GHRP-6 and others to stimulate motor activity in the intestinal tract and to treat conditions such as ileus and emesis. For example, ghrelin and GHRP-6 have been shown to accelerate gastric emptying in rats and mice (Peeters, T. L., J Physiol. Pharmacol., (2003), 54 (supp 4):95-103). In rats, ghrelin has been shown to reverse the delay of gastric emptying in a post-operative ileus model (Peeters, T. L., J Physiol. Pharmacol., (2003), 54 (supp 4):95-103; Trudel, L. et al., J. Physiol. Gastrointest. Liver Physiol., (2002), 282(6):G948-52) and in laparectomized dogs, ghrelin was shown to improve POI in the treated animals (Trudel, L. et al, Peptides, (2003), 24:531-4). In septic mice, ghrelin and GHRP-6 accelerated gastric emptying although had little effect upon increasing transit in the small intestine (De Winter, B. Y. et al., Neurogastroenterol. Motil., (2004), 16:439-46).

In experiments designed to mimic hospitalization conditions for a human patient experiencing POI, laparectomized rats were exposed to opiates as well as ghrelin analog RC-1139 (Poitras, P. et al., Peptides, (2005), 26:1598-601). In an assay measuring gastric emptying, RC-1139 was shown to reverse POI in the control and laparectomized rats in the presence of morphine. It is thus believed that ghrelin exhibits gastrokinetic effects without interfering with opiate activity.

Ferrets exposed to the cytotoxic anti-cancer agent cisplatin exhibited significantly reduced occurrences of retching and vomiting following intracerebroventricular administration of ghrelin (Rudd, J. A. et al., Neurosci. Lett., (2006), 392:79-83) thus confirming the ability of ghrelin to reduce emesis in a manner consistent with its role in modulating gastro-intestinal functions. It is thought that ghrelin's role in modulating gastric motility is independent of the GH-secretory activation and may be mediated by the vagal-cholinergic muscarinic pathway (U.S. Patent Application No. 20060025566).

Ghrelin has also been shown to increase gastric emptying in patients with diabetic gastroparesis (Murray, C. D. et al., Gut, (2005), 54:1693-8).

It is interesting to note that in the studies referenced above, the ghrelin or ghrelin analog was administered using intraperitoneal (ip), intravenous (iv) or intracerebroventricular (icy) injection. Other disclosures (U.S. Pat. No. 6,548,501; U.S. Patent Application No. 20020042419; U.S. Patent Application No. 20050187237; U.S. Patent Application No. 20060025566) report on the oral administration of GHSs as a means to treat impaired gastrointestinal motility.

Very few compounds are known in the art to be useful for treating impaired GI motility and more compounds affecting gastrointestinal motility, e.g. stimulation of motility, would be highly desirable. Compounds affecting gastrointestinal kinetics are useful in the treatment of interruptions in normal GI functions such as ileus and emesis.

SUMMARY OF THE INVENTION

The present invention relates to a method of stimulating gastrointestinal motility in a patient (e.g., a mammal such as a human). The method includes the step of administering a therapeutically effective amount of a peptidyl analog of ghrelin to said patient experiencing or at risk of experiencing gastrointestinal dysmotility.

In one aspect, the present invention provides a method of treating gastrointestinal dysmotility conditions by administering a therapeutically effective amount of a peptidyl analog of ghrelin or prodrug thereof suitable for attenuating such gastrointestinal conditions where the analog or prodrug comprises a compound according to Formula (I), Formula (II) or Formula (III), or a pharmaceutically acceptable salt thereof. The method of the invention is useful for promoting gastric and gastrointestinal motility in a patient (e.g., a mammal such as a human) and as such, is useful for treating conditions benefiting from improved gastric and gastrointestinal motility such as gastroesophageal reflux disease (GERD), IBS, constipation, ileus, emesis, gastroparesis, colonic pseudo-obstruction, and the like.

In another aspect, the invention provides a method of treating ileus, gastroparesis or emesis by administering a therapeutically effective amount of a peptidyl analog of ghrelin suitable for attenuating ileus, emesis, or gastroparesis. In yet another aspect, the condition treated by the method of the invention is ileus, such as post-operative ileus and the operation may be a gastrointestinal surgery. In yet another aspect of the invention, the condition treated by the method of the invention is emesis, such as emesis associated with or provoked by the administration of an anti-cancer chemotherapeutic agent. In yet another aspect, the condition treated by the method of the invention is gastroparesis, such as diabetic gastroparesis. The diabetes may be Type I or Type II diabetes.

In one aspect, the invention provides a method of treating gastrointestinal conditions such as GERD, IBS, constipation, ileus, emesis, gastroparesis, and colonic pseudo-obstruction and the like, by administering a therapeutically effective amount of a peptidyl ghrelin analog according to the following formula (I):

(R²R³)-A¹-A²-A³-A⁴-A⁵-A⁶-A⁷-A⁸-A⁹-A¹⁰-A¹¹-A¹²-A¹³-A¹⁴-A¹⁵-A¹⁶-A¹⁷-A¹⁸-A¹⁹-A²⁰-A²¹-A²²-A²³-A²⁴-A²⁵-A²⁶-A²⁷-A²⁸-R¹

wherein:

A¹ is Gly, Aib, Ala, β-Ala, or Acc;

A² is Ser, Aib, Act, Ala, Acc, Abu, Ava, Thr, or Val;

A³ is Ser, Ser(C(O)—R⁴), Asp(O—R⁸), Asp(NH—R⁹), Cys(S—R¹⁴), Dap(S(O)₂—R¹⁰), Dab(S(O)₂—R¹¹), Glu(O—R⁶), Glu(NH—R⁷), Thr, Thr(C(O)—R⁵), or HN—CH((CH₂)_(n)—N(R¹²R¹³))—C(O);

A⁴ is Phe, Acc, Aic, Cha, 2-Fua, 1-Nal, 2-Nal, 2-Pal, 3-Pal, 4-Pal, hPhe, (X¹,X²,X³,X⁴,X⁵)Phe, Taz, 2-Thi, 3-Thi, Trp, or Tyr;

A⁵ is Leu, Abu, Acc, Aib, Ala, Cha, Ile, hLeu, Nle, Nva, Phe, Tle, or Val;

A⁶ is Ser, Abu, Acc, Act, Aib, Ala, Gly, Thr, or Val;

A⁷ is Pro, Dhp, Dmt, 3-Hyp, 4-Hyp, Inc, Ktp, Oic, Pip, Thz, Tic, or deleted;

A⁸ is Glu, Acc, Aib, Arg, Asn, Asp, Dab, Dap, Gln, Lys, Orn, HN—CH((CH₂)_(n)—N(R¹²R¹³))—C(O), or deleted;

A⁹ is His, Apc, Aib, Acc, 2-Fua, 2-Pal, 3-Pal, 4-Pal, Taz, 2-Thi, 3-Thi, (X¹,X²,X³,X⁴,X⁵-)Phe or deleted;

A¹⁰ is Gln, Acc, Aib, Asn, Asp, Glu, or deleted;

A¹¹ is Arg, Apc, hArg, Dab, Dap, Lys, Orn, HN—CH((CH₂)_(n)—N(R¹²R¹³))—C(O), or deleted;

A¹² is Val, Abu, Acc, Aib, Ala, Cha, Nva, Gly, Ile, Leu, Nle, Tle, or deleted;

A¹³ is Gln, Acc, Aib, Asn, Asp, Glu, or deleted;

A¹⁴ is Gln, Acc, Aib, Asn, Asp, Glu, or deleted;

A¹⁵ is Arg, hArg, Acc, Aib, Apc, Dab, Dap, Lys, Orn, HN—CH((CH₂)_(n)—N(R¹²R¹³))—C(O), or deleted;

A¹⁶ is Lys, Acc, Aib, Apc, Arg, hArg, Dab, Dap, Orn, HN—CH((CH₂)_(n)—N(R¹²R¹³))—C(O), or deleted;

A¹⁷ is Glu, Arg, Asn, Asp, Dab, Dap, Gln, Lys, Orn, HN—CH((CH₂)_(n)—N(R¹²R¹³))—C(O), or deleted;

A¹⁸ is Ser, Abu, Acc, Act, Aib, Ala, Thr, Val, or deleted;

A¹⁹ is Lys, Acc, Aib, Apc, Arg, hArg, Dab, Dap, Orn, HN—CH((CH₂)_(n)—N(R¹²R¹³))—C(O), or deleted;

A²⁰ is Lys, Acc, Aib, Apc, Arg, hArg, Dab, Dap, Orn, HN—CH((CH₂)_(n)—N(R¹²R¹³))—C(O), or deleted;

A²¹ is Pro, Dhp, Dmt, 3-Hyp, 4-Hyp, Inc, Ktp, Oic, Pip, Thz, Tic, or deleted;

A²² is Pro, Dhp, Dmt, 3-Hyp, 4-Hyp, Inc, Ktp, Oic, Pip, Thz, Tic, or deleted;

A²³ is Abu, Acc, Act, Aib, Ala, Apc, Gly, Nva, Val, or deleted;

A²⁴ is Lys, Acc, Aib, Apc, Arg, hArg, Dab, Dap, Orn, HN—CH((CH₂)_(n)—N(R¹²R¹³))—C(O), or deleted;

A²⁵ is Leu, Abu, Acc, Aib, Ala, Cha, Ile, hLeu, Nle, Nva, Phe, Tle, Val, or deleted;

A²⁶ is Gln, Aib, Asn, Asp, Glu, or deleted;

A²⁷ is Pro, Dhp, Dmt, 3-Hyp, 4-Hyp, Inc, Ktp, Oic, Pip, Thz, Tic, or deleted;

A²⁸ is Acc, Aib, Apc, Arg, hArg, Dab, Dap, Lys, Orn, HN—CH((CH₂)_(n)—N(R¹²R¹³))—C(O), or deleted;

R¹ is —OH, —NH₂, —(C₁-C₃₀)alkoxy, or NH—X⁶—CH₂—Z⁰, wherein X⁶ is a (C₁-C₁₂)alkyl, (C₂-C₁₂)alkenyl, and Z⁰ is —H, —OH, —CO₂H or —C(O)—NH₂;

R² and R³ each is, independently for each occurrence, H, (C₁-C₂₀)alkyl or (C₁-C₂₀)acyl;

R⁴, R⁵, R⁶, R⁷, R⁸, R⁹, R¹⁰, R¹¹ and R¹⁴ each is, independently for each occurrence, (C₁-C₄₀)alkyl, (C₂-C₄₀)alkenyl, substituted (C₁-C₄₀)alkyl, substituted (C₂-C₄₀)alkenyl, alkylaryl, substituted alkylaryl, aryl or substituted aryl;

R¹² and R¹³ each is, independently for each occurrence, H, (C₁-C₄₀)alkyl, (C₁-C₄₀)acyl, (C₁-C₃₀)alkylsulfonyl, or —C(NH)—NH₂, wherein when R¹² is (C₁-C₄₀)acyl, (C₁-C₃₀)alkylsulfonyl, or —C(NH)—NH₂, then R¹³ is H or (C₁-C₄₀)alkyl;

n is, independently for each occurrence, 1, 2, 3, 4 or 5;

X¹, X², X³, X⁴, and X⁵ each is, independently for each occurrence, H, F, Cl, Br, I, (C₁₋₁₀)alkyl, substituted (C₁₋₁₀)alkyl, aryl, substituted aryl, OH, NH₂, NO₂, or CN;

provided that the peptide contains at least one amino acid selected from the groups consisting of:

A² is Aib, Acc, or Act;

A³ is Dap(S(O)₂—R¹⁰), Dab(S(O)₂—R¹¹), Glu(NH-Hexyl), or Cys(S-Decyl);

A⁵ is Abu, Acc, Aib, Ala, Cha, Ile, hLeu, Nle, Nva, Phe, Tle, or Val;

A⁶ is Abu, Acc, Act, Aib, Ala, Gly, Thr or Val;

A⁷ is Dhp, Dmt, 3-Hyp, 4-Hyp, Inc, Ktp, Oic, Pip, Thz or Tic;

A⁸ is Acc, Aib, Arg, Asn, Asp, Dab, Dap, Gln, Lys, Orn, or HN—CH((CH₂)_(n)—N(R¹²R¹³))—C(O);

A⁹ is Aib, Acc, Apc, 2-Fua, 2-Pal, 3-Pal, 4-Pal, Taz, 2-Thi, 3-Thi, or (X¹,X²,X³,X⁴,X⁵-) Phe; and

A¹⁰ is Acc, Aib, Asn, Asp, or Glu;

and further provided that the peptide is not (Lys⁸)hGhrelin(1-8)-NH₂ or (Arg⁸)hGhrelin(1-8)-NH₂; or a pharmaceutically acceptable salt thereof.

In another aspect, the invention provides a preferred group of compounds according to formula (I), wherein:

A¹ is Gly or Aib;

A² is Ser, Aib, A5c, Act, or Ava;

A³ is Ser(C(O)—R⁴), Glu(O—R⁶), Glu(NH—R⁷), Dap(S(O)₂—R¹⁰), or Dab(S(O)₂—R¹¹);

A⁴ is Phe;

A⁵ is Leu, Acc, Aib, Cha, or hLeu;

A⁶ is Ser, Abu, Act, Aib, or Thr;

A⁷ is Pro, Dhp, Dmt, 4-Hyp, Ktp, Pip, Tic, or Thz;

A⁸ is Glu or Aib;

A⁹ is His, Aib, Apc, 2-Fua, 2-Pal, 3-Pal, 4-Pal, Taz, or 2-Thi;

A¹⁰ is Gln or Aib;

A¹¹ is Arg;

A¹² is Aib, Val or Acc;

A¹³ is Gln;

A¹⁴ is Gln;

A¹⁵ is Arg or Orn;

A¹⁶ is Lys or Apc;

A¹⁷ is Glu;

A¹⁸ is Ser;

A¹⁹ is Lys;

A²⁰ is Lys;

A²¹ is Pro;

A²² is Pro;

A²³ is Ala;

A²⁴ is Lys;

A²⁵ is Leu;

A²⁶ is Gln;

A²⁷ is Pro; and

A²⁸ is Arg, or a pharmaceutically acceptable salt thereof.

In yet another aspect, the invention provides a preferred group of compounds according to formula (I), wherein:

R² and R³ each is, independently, H, Acyl, n-butyryl, isobutyryl, or n-octanoyl;

R⁴ is octyl;

R⁶ is hexyl;

R⁷ is hexyl;

R¹⁰ is octyl; and

R¹¹ is octyl, or a pharmaceutically acceptable salt thereof, wherein Acc is, independently for each occurrence, A5c or A6c.

In yet another aspect, the invention provides a preferred group of compounds according to formula (I), where the compound is:

(SEQ ID NO: 1) (Dap³(octanesulfonyl))hGhrelin(1-28)-NH₂; Example #75 (SEQ ID NO: 2) (Aib², A6c⁵)hGhrelin(1-28)-NH₂; Example #96 (SEQ ID NO: 3) (A6c⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 4) (Aib^(2,6))hGhrelin(1-28)-NH₂; Example #108 (SEQ ID NO: 5) (Aib², A5c¹²)hGhrelin(1-28)-NH₂; (SEQ ID NO: 6) (Aib², A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 7) (Aib², A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 7) (Aib², Act⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 8) (Aib², 3-Pal⁹)hGhrelin(1-28)-NH₂; Example #29 (SEQ ID NO: 9) (Aib², Dmt⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 9) (Aib², Thz⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 10) (A5c²)hGhrelin(1-28)-NH₂; Example #52 (SEQ ID NO: 10) (Act²)hGhrelin(1-28)-NH₂; Example #94 (SEQ ID NO: 2) (Aib², A5c⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 2) (Aib², A6c⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 2) (Aib^(2,5))hGhrelin(1-28)-NH₂; (SEQ ID NO: 2) (Aib², hLeu⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 2) (Aib², Cha⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 4) (Aib^(2,6))hGhrelin(1-28)-NH₂; (SEQ ID NO: 4) (Aib², Act⁶)hGhrelin(1-28)-NH₂; Example #114 (SEQ ID NO: 4) (Aib², Thr⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 4) (Aib², Abu⁶)hGhrelin(1-28)-NH₂; Example #88 (SEQ ID NO: 9) (Aib², 4-Hyp⁷)hGhrelin(1-28)-NH₂; Example #36 (SEQ ID NO: 9) (Aib², Thz⁷)hGhrelin(1-28)-NH₂; Example #54 (SEQ ID NO: 9) (Aib², Pip⁷)hGhrelin(1-28)-NH₂; Example #65 (SEQ ID NO: 9) (Aib², Dhp⁷)hGhrelin(1-28)-NH₂; Example #44 (SEQ ID NO: 9) (Aib², Ktp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 11) (Aib^(2,8))hGhrelin(1-28)-NH₂;Example #49 (SEQ ID NO: 8) (Aib², 2-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 8) (Aib², 3-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 8) (Aib², 4-Pal⁹)hGhrelin(1-28)-NH₂; Example #55 (SEQ ID NO: 8) (Aib², Taz⁹)hGhrelin(1-28)-NH₂; Example #27 (SEQ ID NO: 8) (Aib², 2-Thi⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 8) (Aib², 2-Fua⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 8) (Aib², Apc⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 8) (Aib^(2,9))hGhrelin(1-28)-NH₂; (SEQ ID NO: 12) (Aib^(2,10))hGhrelin(1-28)-NH₂; Example #48 (SEQ ID NO: 9) (Aib², Tic⁷)hGhrelin(1-28)-NH₂; Example #53 (SEQ ID NO: 13) (Aib⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 3) (A5c⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 3) (A6c⁵)hGhrelin(1-28)-NH₂; Example #102 (SEQ ID NO: 13) (Act⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 14) (3-Pal⁹)hGhrelin(1-28)-NH₂; Example #32 (SEQ ID NO: 15) (Dmt⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 15) (Thz⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 3) (Aib⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 3) (hLeu⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 3) (Cha⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 13) (Thr⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 13) (Abu⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 15) (4-Hyp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 15) (Pip⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 15) (Dhp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 15) (Ktp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 16) (Aib⁸)hGhrelin(1-28)-NH₂; Example #10 (SEQ ID NO: 14) (2-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 14) (3-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 14) (4-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 14) (Taz⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 14) (2-Thi⁹)hGhrelin(1-28)-NH₂; Example #26 (SEQ ID NO: 14) (2-Fua⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 14) (Apc⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 14) (Aib⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 17) (Aib¹⁰)hGhrelin(1-28)-NH₂; (SEQ ID NO: 18) (Aib², Dap³(octanesulfonyl), A6c⁵)hGhrelin(1-28)- NH₂; (SEQ ID NO: 19) (Dap³(octanesulfonyl), A6c⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 20) (Aib^(2,6), Dap³(octanesulfonyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 21) (Aib², Dap³(octanesulfonyl), A5c¹²)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 22) (Aib², Dap³(octanesulfonyl), A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 23) (Aib², Dap³(octanesulfonyl), A5c¹², Apc¹⁶)hGhrelin (1-28)-NH₂; (SEQ ID NO: 20) (Aib², Dap³(octanesulfonyl), Act⁶)hGhrelin(1-28)- NH₂; (SEQ ID NO: 24) (Aib², Dap³(octanesulfonyl), 3-Pal⁹)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 25) (Aib², Dap³(octanesulfonyl), Dmt⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 25) (Aib², Dap³(octanesulfonyl), Thz⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 26) (A5c², Dap³(octanesulfonyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 26) (Act², Dap³(octanesulfonyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 18) (Aib², Dap³(octanesulfonyl), A5c⁵)hGhrelin(1-28)- NH₂; (SEQ ID NO: 18) (Aib^(2,5), Dap³(octanesulfonyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 18) (Aib², Dap³(octanesulfonyl), hLeu⁵)hGhrelin(1-28)- NH₂; (SEQ ID NO: 18) (Aib², Dap³(octanesulfonyl), Cha⁵)hGhrelin(1-28)- NH₂; (SEQ ID NO: 20) (Aib^(2,6), Dap³(octanesulfonyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 20) (Aib², Dap³(octanesulfonyl), Thr⁶)hGhrelin(1-28)- NH₂; (SEQ ID NO: 20) (Aib², Dap³(octanesulfonyl), Abu⁶)hGhrelin(1-28)- NH₂; (SEQ ID NO: 25) (Aib², Dap³(octanesulfonyl), 4-Hyp⁷)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 25) (Aib², Dap³(octanesulfonyl), Pip⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 25) (Aib², Dap³(octanesulfonyl), Dhp⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 25) (Aib², Dap³(octanesulfonyl), Ktp⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 27) (Aib^(2,8), Dap³(octanesulfonyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 24) (Aib², Dap³(octanesulfonyl), 2-Pal⁹)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 24) (Aib², Dap³(octanesulfonyl), 3-Pal⁹)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 24) (Aib², Dap³(octanesulfonyl), 4-Pal⁹)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 24) (Aib², Dap³(octanesulfonyl), Taz⁹)hGhrelin(1-28)- NH₂; (SEQ ID NO: 24) (Aib², Dap³(octanesulfonyl), 2-Thi⁹)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 24) (Aib², Dap³(octanesulfonyl), 2-Fua⁹)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 24) (Aib², Dap³(octanesulfonyl), Apc⁹)hGhrelin(1-28)- NH₂; (SEQ ID NO: 24) (Aib^(2,9), Dap³(octanesulfonyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 28) (Aib^(2,10), Dap³(octanesulfonyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 19) (Dap³(octanesulfonyl), A6c⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 29) (Dap³(octanesulfonyl), Aib⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 30) (Dap³(octanesulfonyl), A5c¹²)hGhrelin(1-28)-NH₂; (SEQ ID NO: 31) (Dap³(octanesulfonyl), A5c¹², Orn¹⁵)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 32) (Dap³(octanesulfonyl), A5c¹², Apc¹⁶)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 29) (Dap³(octanesulfonyl), Act⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 33) (Dap³(octanesulfonyl), 3-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 34) (Dap³(octanesulfonyl), Dmt⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 34) (Dap³(octanesulfonyl), Thz⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 19) (Dap³(octanesulfonyl), A5c⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 19) (Dap³(octanesulfonyl), Aib⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 19) (Dap³(octanesulfonyl), hLeu⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 19) (Dap³(octanesulfonyl), Cha⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 29) (Dap³(octanesulfonyl), Thr⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 29) (Dap³(octanesulfonyl), Abu⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 34) (Dap³(octanesulfonyl), 4-Hyp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 34) (Dap³(octanesulfonyl), Pip⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 34) (Dap³(octanesulfonyl), Dhp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 34) (Dap³(octanesulfonyl), Ktp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 35) (Dap³(octanesulfonyl), Aib⁸)hGhrelin(1-28)-NH₂; (SEQ ID NO: 33) (Dap³(octanesulfonyl), 2-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 33) (Dap³(octanesulfonyl), 3-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 33) (Dap³(octanesulfonyl), 4-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 33) (Dap³(octanesulfonyl), Taz⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 33) (Dap³(octanesulfonyl), 2-Thi⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 33) (Dap³(octanesulfonyl), 2-Fua⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 33) (Dap³(octanesulfonyl), Apc⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 33) (Dap³(octanesulfonyl), Aib⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 36) (Dap³(octanesulfonyl), Aib¹⁰)hGhrelin(1-28)-NH₂; (SEQ ID NO: 31) (Dap³(octanesulfonyl), A5c¹², Orn¹⁵)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 31) (Dab³(octanesulfonyl), A5c¹², Orn¹⁵)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 37) (Aib², A6c⁵, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 38) (A6c⁵, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 39) (Aib^(2,6), A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 39) (Aib², Act⁶, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 40) (Aib², 3-Pal⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 41) (Aib², Dmt⁷, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 41) (Aib², Thz⁷, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 37) (Aib², A5c⁵, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 37) (Aib^(2,5), A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 37) (Aib², hLeu⁵, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 37) (Aib², Cha⁵, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 39) (Aib^(2,6), A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 39) (Aib², Thr⁶, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 39) (Aib², Abu⁶, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 41) (Aib², 4-Hyp', A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 41) (Aib², Pip⁷, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 41) (Aib², Dhp⁷, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 41) (Aib², Ktp⁷, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 42) (Aib^(2,8), A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 40) (Aib², 2-Pal⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 40) (Aib², 3-Pal⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 40) (Aib², 4-Pal⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 40) (Aib², Taz⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 40) (Aib², 2-Thi⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 40) (Aib², 2-Fua⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 40) (Aib², Apc⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 40) (Aib^(2,9), A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 43) (Aib^(2,10), A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 32) (Dap³(octanesulfonyl), A5c¹², Apc¹⁶)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 32) (Dab³(octanesulfonyl), A5c¹², Apc¹⁶)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 44) (Aib², A6c⁵, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 45) (A6c⁵, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 46) (Aib^(2,6), A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 46) (Aib², Act⁶, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 47) (Aib², 3-Pal⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 48) (Aib², Dmt⁷, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 48) (Aib², Thz⁷, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 44) (Aib², A5c^(5,12), Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 44) (Aib^(2,5), A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 44) (Aib², hLeu⁵, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 44) (Aib², Cha⁵, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 46) (Aib^(2,6), A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 46) (Aib², Thr⁶, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 46) (Aib², Abu', A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 48) (Aib², 4-Hyp⁷, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 48) (Aib², Pip⁷, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 48) (Aib², Dhp⁷, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 48) (Aib², Ktp⁷, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 49) (Aib^(2,8), A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 47) (Aib², 2-Pal⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 47) (Aib², 3-Pal⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 47) (Aib², 4-Pal⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 47) (Aib², Taz⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 47) (Aib², 2-Thi⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 47) (Aib², 2-Fua⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 47) (Aib², Apc⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 47) (Aib^(2,9), A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 50) (Aib^(2,10), A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 38) (A6c⁵, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 51) (Aib⁶, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 51) (Act⁶, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 52) (3-Pal⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 53) (Dmt⁷, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 53) (Thz⁷, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 38) (A5c⁵, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 38) (Aib⁵, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 38) (hLeu⁵, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 38) (Cha⁵, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 51) (Aib⁶, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 51) (Thr⁶, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 51) (Abu⁶, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 53) (4-Hyp⁷, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 53) (Pip⁷, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 53) (Dhp⁷, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 53) (Ktp⁷, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 54) (Aib⁸, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 52) (2-Pal⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 52) (3-Pal⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 52) (4-Pal⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 52) (Taz⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 52) (2-Thi⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 52) (2-Fua⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 52) (Apc⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 52) (Aib⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 55) (Aib¹⁰, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 56) (Aib⁶, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 45) (A5c⁵, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 56) (Act⁶, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 57) (3-Pal⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 58) (Dmt⁷, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 58) (Thz⁷, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 45) (Aib⁵, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 45) (hLeu⁵, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 45) (Cha⁵, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 56) (Thr⁶, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 56) (Abu⁶, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 58) (4-Hyp⁷, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 58) (Pip⁷, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 58) (Dhp⁷, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 58) (Ktp⁷, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 59) (Aib⁸, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 57) (2-Pal⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 57) (3-Pal⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 57) (4-Pal⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 57) (Taz⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 57) (2-Thi⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 57) (2-Fua⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 57) (Apc⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 57) (Aib⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 60) (Aib¹⁰, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 61) (Aib², Glu³(NH-hexyl), A6c⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 62) (Glu³(NH-hexyl), A6c⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 63) (Aib^(2,6), Glu³(NH-hexyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 63) (Aib², Glu³(NH-hexyl), Act⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 64) (Aib², Glu³(NH-hexyl), 3-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 65) (Aib², Glu³(NH-hexyl), Dmt⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 65) (Aib², Glu³(NH-hexyl), Thz⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 61) (Aib², Glu³(NH-hexyl), A5c⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 61) (Aib^(2,5), Glu³(NH-hexyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 61) (Aib², Glu³(NH-hexyl), hLeu⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 2) (Aib², Cha⁵)hGhrelin(1-28)-NH₂; Example #81 (SEQ ID NO: 63) (Aib^(2,6), Glu³(NH-hexyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 63) (Aib², Glu³(NH-hexyl), Thr⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 63) (Aib², Glu³(NH-hexyl), Abu⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 65) (Aib², Glu³(NH-hexyl), 4-Hyp⁷)hGhrelin(1-28)-NH₂; Example #79 (SEQ ID NO: 65) (Aib², Glu³(NH-hexyl), Pip⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 65) (Aib², Glu³(NH-hexyl), Dhp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 65) (Aib², Glu³(NH-hexyl), Ktp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 27) (Aib^(2,8), Glu³(NH-hexyl))hGhrelin(1-28)-NH₂; Example #56 (SEQ ID NO: 64) (Aib², Glu³(NH-hexyl), 2-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 64) (Aib², Glu³(NH-hexyl), 3-Pal⁹)hGhrelin(1-28)-NH₂; Example #80 (SEQ ID NO: 64) (Aib², Glu³(NH-hexyl), 4-Pal⁹)hGhrelin(1-28)-NH₂; Example #85 (SEQ ID NO: 64) (Aib², Glu³(NH-hexyl), Taz⁹)hGhrelin(1-28)-NH₂; Example #43 (SEQ ID NO: 64) (Aib², Glu³(NH-hexyl), 2-Thi⁹)hGhrelin(1-28)-NH₂; Example #51 (SEQ ID NO: 64) (Aib², Glu³(NH-hexyl), 2-Fua⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 64) (Aib², Glu³(NH-hexyl), Apc⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 64) (Aib^(2,9), Glu³(NH-hexyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 28) (Aib^(2,10), Glu³(NH-hexyl))hGhrelin(1-28)-NH₂; Example #59 (SEQ ID NO: 66) (Glu³(NH-hexyl), Aib⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 62) (Glu³(NH-hexyl), A5c⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 66) (Glu³(NH-hexyl), Act⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 67) (Glu³(NH-hexyl), 3-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 68) (Glu³(NH-hexyl), Dmt⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 68) (Glu³(NH-hexyl), Thz⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 62) (Glu³(NH-hexyl), Aib⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 62) (Glu³(NH-hexyl), hLeu⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 62) (Glu³(NH-hexyl), Cha⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 66) (Glu³(NH-hexyl), Thr⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 66) (Glu³(NH-hexyl), Abu⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 68) (Glu³(NH-hexyl), 4-Hyp⁷)hGhrelin(1-28)-NH₂; Example #82 (SEQ ID NO: 68) (Glu³(NH-hexyl), Pip⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 68) (Glu³(NH-hexyl), Dhp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 68) (Glu³(NH-hexyl), Ktp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 35) (Glu³(NH-hexyl), Aib⁸)hGhrelin(1-28)-NH₂; Example (SEQ ID NO: 67) (Glu³(NH-hexyl), 2-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 67) (Glu³(NH-hexyl), 3-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 67) (Glu³(NH-hexyl), 4-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 67) (Glu³(NH-hexyl), Taz⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 67) (Glu³(NH-hexyl), 2-Thi⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 67) (Glu³(NH-hexyl), 2-Fua⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 67) (Glu³(NH-hexyl), Apc⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 67) (Glu³(NH-hexyl), Aib⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 36) (Glu³(NH-hexyl), Aib¹⁰)hGhrelin(1-28)-NH₂; (SEQ ID NO: 69) (Aib², Glu³(NH-hexyl), A6c⁵, A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 70) (A6c⁵, Glu³(NH-hexyl), A5c¹², Orn¹⁵)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 71) (Aib^(2,6), Glu³(NH-hexyl), A5c¹², Orn¹⁵)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 71) (Aib², Glu³(NH-hexyl), Act⁶, A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 72) (Aib², Glu³(NH-hexyl), 3-Pal⁹, A5c¹², Orn¹⁵) hGhrelin(1-28)-NH₂; (SEQ ID NO: 73) (Aib², Glu³(NH-hexyl), Dmt⁷, A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 73) (Aib², Glu³(NH-hexyl), Thz⁷, A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 69) (Aib², Glu³(NH-hexyl), A5c⁵, A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 69) (Aib^(2,5), Glu³(NH-hexyl), A5c¹²,Orn¹⁵)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 37) (Aib², hLeu⁵, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 69) (Aib², Glu³(NH-hexyl), Cha⁵, A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 71) (Aib^(2,6), Glu³(NH-hexyl), A5c¹², Orn¹⁵)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 71) (Aib², Glu³(NH-hexyl), Thr⁶, A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 71) (Aib², Glu³(NH-hexyl), Abu⁶, A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 73) (Aib², Glu³(NH-hexyl), 4-Hyp⁷, A5c¹², Orn¹⁵) hGhrelin(1-28)-NH₂; (SEQ ID NO: 73) (Aib², Glu³(NH-hexyl), Pip⁷, A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 73) (Aib², Glu³(NH-hexyl), Dhp⁷, A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 73) (Aib², Glu³(NH-hexyl), Ktp⁷, A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 74) (Aib^(2,8), Glu³(NH-hexyl), A5c¹², Orn¹⁵)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 72) (Aib², Glu³(NH-hexyl), 2-Pal⁹, A5c¹², Orn¹⁵) hGhrelin(1-28)-NH₂; (SEQ ID NO: 72) (Aib², Glu³(NH-hexyl), 3-Pal⁹, A5c¹², Orn¹⁵) hGhrelin(1-28)-NH₂; (SEQ ID NO: 72) (Aib², Glu³(NH-hexyl), 4-Pal⁹, A5c¹², Orn¹⁵) hGhrelin(1-28)-NH₂; (SEQ ID NO: 72) (Aib², Glu³(NH-hexyl), Taz⁹, A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 72) (Aib², Glu³(NH-hexyl), 2-Thi⁹, A5c¹², Orn¹⁵) hGhrelin(1-28)-NH₂; (SEQ ID NO: 72) (Aib², Glu³(NH-hexyl), 2-Fua⁹, A5c¹², Orn¹⁵) hGhrelin(1-28)-NH₂; (SEQ ID NO: 72) (Aib², Glu³(NH-hexyl), Apc⁹, A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 72) (Aib^(2,9), Glu³(NH-hexyl), A5c¹², Orn¹⁵)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 75) (Aib2,12, Glu³(NH-hexyl), 4-Pal⁹, Orn¹⁵)hGhrelin (1-28)-NH₂; Example #89 (SEQ ID NO: 76) (Aib^(2,10), Glu³(NH-hexyl), A5c¹², Orn¹⁵)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 77) (Aib², Glu³(NH-hexyl), A6c⁵, A5c¹², Apc¹⁶)hGhrelin (1-28)-NH₂; (SEQ ID NO: 78) (Glu³(NH-hexyl), A6c⁵, A5c¹², Apc¹⁶)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 79) (Aib^(2,6), Glu³(NH-hexyl), A5c¹², Apc¹⁶)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 79) (Aib², Glu³(NH-hexyl), Act⁶, A5c¹², Apc¹⁶)hGhrelin (1-28)-NH₂; (SEQ ID NO: 80) (Aib², Glu³(NH-hexyl), 3-Pal⁹, A5c¹², Apc¹⁶) hGhrelin(1-28)-NH₂; (SEQ ID NO: 81) (Aib², Glu³(NH-hexyl), Dmt⁷, A5c¹², Apc¹⁶)hGhrelin (1-28)-NH₂; (SEQ ID NO: 81) (Aib², Glu³(NH-hexyl), Thz⁷, A5c¹², Apc¹⁶)hGhrelin (1-28)-NH₂; (SEQ ID NO: 77) (Aib², Glu³(NH-hexyl), A5c^(5,12), Apc¹⁶)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 77) (Aib^(2,5), Glu³(NH-hexyl), A5c¹², Apc¹⁶)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 77) (Aib², Glu³(NH-hexyl), hLeu⁵, A5c¹², Apc¹⁶) hGhrelin(1-28)-NH₂; (SEQ ID NO: 77) (Aib², Glu³(NH-hexyl), Cha⁵, A5c¹², Apc¹⁶)hGhrelin (1-28)-NH₂; (SEQ ID NO: 79) (Aib^(2,6), Glu³(NH-hexyl), A5c¹², Apc¹⁶)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 79) (Aib², Glu³(NH-hexyl), Thr⁶, A5c¹², Apc¹⁶)hGhrelin (1-28)-NH₂; (SEQ ID NO: 79) (Aib², Glu³(NH-hexyl), Abu⁶, A5c¹², Apc¹⁶)hGhrelin (1-28)-NH₂; (SEQ ID NO: 81) (Aib², Glu³(NH-hexyl), 4-Hyp⁷, A5c¹², Apc¹⁶) hGhrelin(1-28)-NH₂; (SEQ ID NO: 81) (Aib², Glu³(NH-hexyl), Pip⁷, A5c¹², Apc¹⁶)hGhrelin (1-28)-NH₂; (SEQ ID NO: 81) (Aib², Glu³(NH-hexyl), Dhp⁷, A5c¹², Apc¹⁶)hGhrelin (1-28)-NH₂; (SEQ ID NO: 81) (Aib², Glu³(NH-hexyl), Ktp⁷, A5c¹², Apc¹⁶)hGhrelin (1-28)-NH₂; (SEQ ID NO: 82) (Aib^(2,8), Glu³(NH-hexyl), A5c¹², Apc¹⁶)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 80) (Aib², Glu³(NH-hexyl), 2-Pal⁹, A5c¹², Apc¹⁶) hGhrelin(1-28)-NH₂; (SEQ ID NO: 80) (Aib², Glu³(NH-hexyl), 3-Pal⁹, A5c¹², Apc¹⁶) hGhrelin(1-28)-NH₂; (SEQ ID NO: 80) (Aib², Glu³(NH-hexyl), 4-Pal⁹, A5c¹², Apc¹⁶) hGhrelin(1-28)-NH₂; (SEQ ID NO: 80) (Aib², Glu³(NH-hexyl), Taz⁹, A5c¹², Apc¹⁶)hGhrelin (1-28)-NH₂; (SEQ ID NO: 80) (Aib², Glu³(NH-hexyl), 2-Thi⁹, A5c¹², Apc¹⁶) hGhrelin(1-28)-NH₂; (SEQ ID NO: 80) (Aib², Glu³(NH-hexyl), 2-Fua⁹, A5c¹², Apc¹⁶) hGhrelin(1-28)-NH₂; (SEQ ID NO: 80) (Aib², Glu³(NH-hexyl), Apc⁹, A5c¹², Apc¹⁶)hGhrelin (1-28)-NH₂; (SEQ ID NO: 80) (Aib^(2,9), Glu³(NH-hexyl), A5c¹², Apc¹⁶)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 83) (Aib^(2,10), Glu³(NH-hexyl), A5c¹², Apc¹⁶)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 1) (Glu³(O-hexyl))hGhrelin(1-28)-NH₂; Example #21 (SEQ ID NO: 10) (Aib2)hGhrelin(1-28)-NH₂; Example #25 (SEQ ID NO: 1) (Glu³(NH-hexyl))hGhrelin(1-28)-NH₂; Example #76 (SEQ ID NO: 84) (Aib², Glu³(O-hexyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 85) (Aib¹, Glu³(O-hexyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 84) (Aib², Glu³(NH-hexyl))hGhrelin(1-28)-NH₂; Example #8 (SEQ ID NO: 1) (Dap³(1-octanesulfonyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 84) (Aib², Dap³(1-octanesulfonyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 85) (Aib¹, Dap³(1-octanesulfonyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 86) (Ava², Dap³(1-octanesulfonyl))hGhrelin(2-28)-NH₂; (SEQ ID NO: 87) (Ac-Gly¹)hGhrelin(1-5)-NH₂; (SEQ ID NO: 88) (Ac-Gly¹)hGhrelin(1-6)-NH₂; (SEQ ID NO: 89) (Ac-Gly¹)hGhrelin(1-7)-NH₂; (SEQ ID NO: 90) (Ac-Gly¹, Aib²)hGhrelin(1-28)-NH₂; Example #63 (SEQ ID NO: 91) (Ac-Gly¹, Aib², Glu³(NH-hexyl))hGhrelin(1-5)-NH₂; (SEQ ID NO: 92) (Ac-Gly¹, Aib², Glu³(NH-hexyl))hGhrelin(1-6)-NH₂; (SEQ ID NO: 93) (Ac-Gly¹, Aib², Glu³(NH-hexyl))hGhrelin(1-7)-NH₂; (SEQ ID NO: 94) (Ac-Gly¹, Aib², Glu³(NH-hexyl), Arg⁸)hGhrelin(1- 8)-NH₂; (SEQ ID NO: 94) (Ac-Gly¹, Aib², Glu³(NH-hexyl), Lys⁸)hGhrelin(1- 8)-NH₂; (SEQ ID NO: 95) (n-butyryl-Gly¹)hGhrelin(1-28)-NH₂; Example #95 (SEQ ID NO: 95) (isobutyryl-Gly¹)hGhrelin(1-28)-NH₂; Example #99 (SEQ ID NO: 95) (n-octanoyl-Gly¹)hGhrelin(1-28)-NH₂; Example #92 (SEQ ID NO: 1) Cys³(S(CH₂)₉CH₃)hGhrelin(1-28)-NH₂; Example #61 (SEQ ID NO: 3) (Lys⁵)hGhrelin(1-28)-NH₂Example #42 (SEQ ID NO: 10) (Aib², Ser³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 4) (Aib^(2,6), Ser³)hGhrelin(1-28)-NH₂ (SEQ ID NO: 8) (Aib², Ser³, 3-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 9) (Aib², Ser³, Thz⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 2) (Aib², Ser³, Cha⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 4) (Aib², Ser³, Abu⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 9) (Aib², Ser³, 4-Hyp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 8) (Aib², Ser³, Taz⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 9) (Aib², Ser³, Dhp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 11) (Aib^(2,8), Ser³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 9) (Aib², Ser³, Pip⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 96) (Ac-Gly¹, Aib^(2,10), Ser³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 12) (Aib^(2,10), Ser³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 97) (n-butyryl-Gly¹, Aib², Ser³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 97) (Ac-Gly¹, Aib², Ser³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 9) (Aib², Ser³, Tic⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 98) (Ac-Gly¹, Aib², Ser³, Arg8)hGhrelin(1-28)-NH₂; (SEQ ID NO: 16) (Ser³, Aib⁸)hGhrelin(1-28)-NH₂; (SEQ ID NO: 14) (Ser³, Taz⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 14) (Ser³, 3-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 14) (Ser³, 4-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 8) (Aib², Ser³, 2-Thi⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 14) (Ser³, 2-Thi⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 15) (Ser³, 4-Hyp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 9) (Aib², Ser³, Tic⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 99) (Aib², Thr³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 99) (Aib^(2,6), Thr³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 100) (A5c⁵, Thr³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 101) (Aib², Thr³, 3-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 102) (Aib², Thr³, Thz⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 103) (Aib², Thr³, Cha⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 99) (Aib², Thr³, Abu⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 102) (Aib², Thr³, 4-Hyp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 101) (Aib², Thr³, Taz⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 102) (Aib², Thr³, Dhp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 11) (Aib^(2,8), Thr³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 102) (Aib², Thr³, Pip⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 104) (Ac-Gly¹, Aib^(2,10), Thr³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 106) (Aib^(2,10), Thr³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 105) (n-butyryl-Gly¹, Aib², Thr³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 105) (Ac-Gly¹, Aib², Thr³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 102) (Aib², Thr³, Tic⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 90) (Ac-Gly¹, Aib², Thr³, Arg⁸)hGhrelin(1-28)-NH₂; (SEQ ID NO: 107) (Thr³, Aib⁸)hGhrelin(1-28)-NH₂; (SEQ ID NO: 108) (Thr³, Taz⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 108) (Thr³, 3-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 108) (Thr³, 4-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 101) (Aib², Thr³, 2-Thi⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 108) (Thr³, 2-Thi⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 109) (Thr³, 4-Hyp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 102) (Aib², Thr³, Tic⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 110) (Ac-Gly¹, Glu³(NH-hexyl))hGhrelin(1-28)-NH₂; or  or pharmaceutically acceptable salts thereof.

In one aspect, the invention provides a method of treating gastrointestinal conditions such as gastroesophageal reflux disease, IBS, constipation, ileus, emesis, gastroparesis, and colonic pseudo-obstruction and the like, by administering a therapeutically effective amount of a peptidyl ghrelin analog according to the following formula (II):

R¹-A¹-A²-A³-A⁴-A⁵-R²

wherein:

A¹ is Aib, Apc or Inp;

A² is D-Bal, D-Bip, D-Bpa, D-Dip, D-1-Nal, D-2-Nal, D-Ser(Bzl), or D-Trp;

A³ is D-Bal, D-Bip, D-Bpa, D-Dip, D-1-Nal, D-2-Nal, D-Ser(Bzl), or D-Trp;

A⁴ is 2-Fua, Orn, 2-Pal, 3-Pal, 4-Pal, Pff, Phe, Pim, Taz, 2-Thi, 3-Thi, Thr(Bzl);

A⁵ is Apc, Dab, Dap, Lys, Orn, or deleted;

R¹ is hydrogen, (C₁₋₆)alkyl, (C₅₋₁₄)aryl, (C₁₋₆)alkyl(C₅₋₁₄)aryl, (C₃₋₈)cycloakyl, or (C₂₋₁₀)acyl; and

R² is OH or NH₂;

provided that when A⁵ is Dab, Dap, Lys, or Orn, then:

-   -   A² is D-Bip, D-Bpa, D-Dip or D-Bal; or     -   A³ is D-Bip, D-Bpa, D-Dip or D-Bal; or     -   A⁴ is 2-Thi, 3-Thi, Taz, 2-Fua, 2-Pal, 3-Pal, 4-Pal, Orn,         Thr(Bzl), or Pff;         when A⁵ is deleted, then:     -   A³ is D-Bip, D-Bpa, or D-Dip; or     -   A⁴ is 2-Fua, Pff, Taz, or Thr(Bzl); or     -   A¹ is Apc when         -   A² is D-Bip, D-Bpa, D-Dip or D-Bal; or         -   A³ is D-Bip, D-Bpa, D-Dip or D-Bal; or         -   A⁴ is 2-Thi, 3-Thi, Orn, 2-Pal, 3-Pal or 4-Pal;             or a pharmaceutically acceptable salt thereof.

In yet another aspect, the invention provides a preferred compound of formula (II), wherein:

A¹ is Aib, Apc or H-Inp;

A² is D-Bal, D-Bip, D-Bpa, D-Dip, D-1-Nal, D-2-Nal, D-Ser(Bzl), or D-Trp;

A³ is D-Bal, D-Bpa, D-Dip, D-1-Nal, D-2-Nal, or D-Trp;

A⁴ is Orn, 3-Pal, 4-Pal, Pff, Phe, Pim, Taz, 2-Thi, or Thr(Bzl); and

A⁵ is Apc, Lys, or deleted;

or a pharmaceutically acceptable salt thereof.

In yet another aspect of the immediately foregoing group of compounds, the invention provides a preferred compound of formula (II), wherein:

A¹ is Apc or H-Inp;

A² is D-Bal, D-Bip, D-1-Nal, or D-2-Nal;

A³ is D-Bal, D-1-Nal, D-2-Nal, or D-Trp;

A⁴ is 3-Pal, 4-Pal, Pff, Phe, Pim, Taz, 2-Thi, or Thr(Bzl); and

or a pharmaceutically acceptable salt thereof.

In yet another aspect, the invention provides a preferred group of compounds according to formula (I), where the compound is:

(SEQ ID NO: 111) Inp-D-2-Nal-D-Trp-Phe-Lys-NH₂Example 2 (SEQ ID NO: 112) H-Inp-D-1-Nal-D-Trp-3-Pal-Lys-NH₂; Example #50 (SEQ ID NO: 113) H-Inp-D-2-Nal-D-Trp-4-Pal-Lys-NH₂; (SEQ ID NO: 113) H-Inp-D-2-Nal-D-Trp-Orn-Lys-NH₂; Example #116 (SEQ ID NO: 111) H-Inp-D-Bip-D-Trp-Phe-Lys-NH₂; Example #66 (SEQ ID NO: 113) H-Inp-D-2-Nal-D-Trp-Thr(Bzl)-Lys-NH₂; (SEQ ID NO: 113) H-Inp-D-2-Nal-D-Trp-Pff-Lys-NH₂; Example #100 (SEQ ID NO: 113) H-Inp-D-2-Nal-D-Trp-2-Thi-Lys-NH₂; Example #15 (SEQ ID NO: 113) H-Inp-D-2-Nal-D-Trp-Taz-Lys-NH₂; Example #37 (SEQ ID NO: 111) H-Inp-D-Dip-D-Trp-Phe-Lys-NH₂; Example #105 (SEQ ID NO: 111) H-Inp-D-Bpa-D-Trp-Phe-Lys-NH₂; Example #109 (SEQ ID NO: 114) H-Inp-D-2-Nal-D-Bpa-Phe-Lys-NH₂; Example #118 (SEQ ID NO: 115) H-Inp-D-2-Nal-D-Trp-3-Pal-NH₂; Example #93 (SEQ ID NO: 115) H-Inp-D-2-Nal-D-Trp-4-Pal-NH₂; Example #112 (SEQ ID NO: 116) H-Inp-D-1-Nal-D-Trp-3-Pal-NH₂; Example #97 (SEQ ID NO: 117) H-Inp-D-Bip-D-Trp-Phe-NH₂; Example #98 (SEQ ID NO: 115) H-Inp-D-2-Nal-D-Trp-Thr(Bzl)-NH₂; Example #87 (SEQ ID NO: 115) H-Inp-D-2-Nal-D-Trp-Pff-NH₂; Example #103 (SEQ ID NO: 115) H-Inp-D-2-Nal-D-Trp-2-Thi-NH₂; Example #84 (SEQ ID NO: 115) H-Inp-D-2-Nal-D-Trp-Taz-NH₂; Example #90 (SEQ ID NO: 117) H-Inp-D-Dip-D-Trp-Phe-NH₂; Example #111 (SEQ ID NO: 118) H-Inp-D-2-Nal-D-Dip-Phe-NH₂; Example #110 (SEQ ID NO: 119) H-Inp-D-Bal-D-Trp-Phe-NH₂; Example #78 (SEQ ID NO: 118) H-Inp-D-2-Nal-D-Bal-Phe-NH₂; Example #101 (SEQ ID NO: 113) H-Inp-D-2-Nal-D-Trp-3-Pal-Lys-NH₂; Example #71 (SEQ ID NO: 120) H-Inp-D-Trp-D-2-Nal(W)-Pim; Example #115 (SEQ ID NO: 121) H-Inp-D-Bal-D-Trp-2-Thi-Lys-NH₂; Example #12 (SEQ ID NO: 111) H-Inp-D-Bal-D-Trp-Phe-Lys-NH₂; Example #5 (SEQ ID NO: 112) H-Inp-D-1-Nal-D-Trp-2-Thi-Lys-NH₂; Example #3 (SEQ ID NO: 122) H-Inp-D-2-Nal-D-Trp-Phe-Apc-NH₂; Example #28 (SEQ ID NO: 122) H-Inp-D-1-Nal-D-Trp-Phe-Apc-NH₂; Example #6 (SEQ ID NO: 122) H-Inp-D-Bal-D-Trp-Phe-Apc-NH₂; Example #19 (SEQ ID NO: 123) H-Apc-D-2-Nal-D-Trp-Phe-Lys-NH₂; Example #11 (SEQ ID NO: 124) H-Apc-D-1-Nal-D-Trp-2-Thi-Lys-NH₂; Example #1 (SEQ ID NO: 116) H-Inp-D-1-Nal-D-Trp-2-Thi-NH₂; Example #39 (SEQ ID NO: 125) H-Apc-D-1-Nal-D-Trp-Phe-NH₂; Example #31 (SEQ ID NO: 126) H-Inp-D-2-Nal-D-Trp(Ψ)-Pim; Example #113 (SEQ ID NO: 126) H-Inp-D-1-Nal-D-Trp(Ψ)-Pim; Example #107 (SEQ ID NO: 126) H-Inp-D-Bal-D-Trp(Ψ)-Pim; Example #106 (SEQ ID NO: 127) H-Aib-D-Ser(Bzl)-D-Trp(Ψ)-Pim; Example #119 (SEQ ID NO: 112) H-Inp-D-1-Nal-D-Trp-Taz-Lys-NH₂; Example #57 (SEQ ID NO: 121) H-Inp-D-Bal-D-Trp-Taz-Lys-NH₂; Example #23 (SEQ ID NO: 124) H-Apc-D-1-Nal-D-Trp-Taz-Lys-NH₂; Example #14 (SEQ ID NO: 128) H-Apc-D-Bal-D-Trp-Taz-Lys-NH₂; Example #20 (SEQ ID NO: 128) H-Apc-D-Bal-D-Trp-2-Thi-Lys-NH₂; Example #7 (SEQ ID NO: 123) H-Apc-D-Bal-D-Trp-Phe-Lys-NH₂; Example #4 (SEQ ID NO: 129) H-Apc-D-1-Nal-D-Trp-Phe-Apc-NH₂; Example #18 (SEQ ID NO: 130) H-Apc-D-Bal-D-Trp-Phe-Apc-NH₂; Example #33 (SEQ ID NO: 129) H-Apc-D-1-Nal-D-1-Nal-Phe-Apc-NH₂; Example #74 (SEQ ID NO: 129) H-Apc-D-1-Nal-D-2-Nal-Phe-Apc-NH₂; Example #73 (SEQ ID NO: 131) H-Apc-D-1-Nal-D-1-Nal-Phe-Lys-NH₂; Example #64 (SEQ ID NO: 130) H-Apc-D-Bal-D-1-Nal-Phe-Apc-NH₂; Example #83 (SEQ ID NO: 130) H-Apc-D-Bal-D-2-Nal-Phe-Apc-NH₂; Example #69 (SEQ ID NO: 132) H-Apc-D-Bal-D-1-Nal-Phe-Lys-NH₂; (SEQ ID NO: 132) H-Apc-D-Bal-D-2-Nal-Phe-Lys-NH₂; Example #30 (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-2-Thi-NH₂; Example #34 (SEQ ID NO: 125) H-Apc-D-Bal-D-Trp-Phe-NH₂; Example #41 (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-Taz-NH₂; Example #67 (SEQ ID NO: 144) H-Apc-D-Bal-D-Trp-2-Thi-NH₂; Example #47 (SEQ ID NO: 144) H-Apc-D-Bal-D-Trp-Taz-NH₂; Example #72 (SEQ ID NO: 134) H-Apc-D-2-Nal-D-Trp-2-Thi-NH₂; Example #45 (SEQ ID NO: 134) H-Apc-D-2-Nal-D-Trp-Taz-NH₂; Example #77 (SEQ ID NO: 135) H-Inp-D-1-Nal-D-Trp-Taz-Apc-NH₂; Example #60 (SEQ ID NO: 135) H-Inp-D-Bal-D-Trp-Taz-Apc-NH₂; Example #38 (SEQ ID NO: 136) H-Apc-D-1-Nal-D-Trp-Taz-Apc-NH₂; Example #46 (SEQ ID NO: 136) H-Apc-D-Bal-D-Trp-Taz-Apc-NH₂; Example #58 (SEQ ID NO: 137) H-Apc-D-1-Nal-D-Trp-2-Fua-Apc-NH₂; (SEQ ID NO: 124) H-Apc-D-1-Nal-D-Trp-2-Fua-Lys-NH₂; (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-2-Fua-NH₂; (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-2-Pal-NH₂; (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-3-Pal-NH₂; (SEQ ID NO: 137) H-Apc-D-1-Nal-D-Trp-3-Thi-Apc-NH₂; (SEQ ID NO: 124) H-Apc-D-1-Nal-D-Trp-3-Thi-Lys-NH₂; (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-3-Thi-NH₂; (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-4-Pal-NH₂; (SEQ ID NO: 137) H-Apc-D-1-Nal-D-Trp-Pff-Apc-NH₂; (SEQ ID NO: 124) H-Apc-D-1-Nal-D-Trp-Pff-Lys-NH₂; (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-Pff-NH₂; (SEQ ID NO: 138) H-Apc-D-2-Nal-D-Trp-2-Fua-Apc-NH₂; (SEQ ID NO: 139) H-Apc-D-2-Nal-D-Trp-2-Fua-Lys-NH₂; (SEQ ID NO: 134) H-Apc-D-2-Nal-D-Trp-2-Fua-NH₂; (SEQ ID NO: 134) H-Apc-D-2-Nal-D-Trp-2-Pal-NH₂; (SEQ ID NO: 138) H-Apc-D-2-Nal-D-Trp-2-Thi-Apc-NH₂; (SEQ ID NO: 139) H-Apc-D-2-Nal-D-Trp-2-Thi-Lys-NH₂; (SEQ ID NO: 134) H-Apc-D-2-Nal-D-Trp-3-Pal-NH₂; (SEQ ID NO: 138) H-Apc-D-2-Nal-D-Trp-3-Thi-Apc-NH₂; (SEQ ID NO: 139) H-Apc-D-2-Nal-D-Trp-3-Thi-Lys-NH₂; (SEQ ID NO: 134) H-Apc-D-2-Nal-D-Trp-3-Thi-NH₂; (SEQ ID NO: 134) H-Apc-D-2-Nal-D-Trp-4-Pal-NH₂; (SEQ ID NO: 138) H-Apc-D-2-Nal-D-Trp-Pff-Apc-NH₂; (SEQ ID NO: 139) H-Apc-D-2-Nal-D-Trp-Pff-Lys-NH₂; (SEQ ID NO: 134) H-Apc-D-2-Nal-D-Trp-Pff-NH₂; (SEQ ID NO: 136) H-Apc-D-2-Nal-D-Trp-Taz-Apc-NH₂; (SEQ ID NO: 139) H-Apc-D-2-Nal-D-Trp-Taz-Lys-NH₂; (SEQ ID NO: 140) H-Apc-D-Bal-D-Bal-2-Fua-Apc-NH₂; (SEQ ID NO: 141) H-Apc-D-Bal-D-Bal-2-Fua-Lys-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-2-Fua-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-2-Pal-NH₂; (SEQ ID NO: 140) H-Apc-D-Bal-D-Bal-2-Thi-Apc-NH₂; (SEQ ID NO: 141) H-Apc-D-Bal-D-Bal-2-Thi-Lys-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-2-Thi-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-3-Pal-NH₂; (SEQ ID NO: 140) H-Apc-D-Bal-D-Bal-3-Thi-Apc-NH₂; (SEQ ID NO: 141) H-Apc-D-Bal-D-Bal-3-Thi-Lys-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-3-Thi-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-4-Pal-NH₂; (SEQ ID NO: 140) H-Apc-D-Bal-D-Bal-Pff-Apc-NH₂; (SEQ ID NO: 141) H-Apc-D-Bal-D-Bal-Pff-Lys-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-Pff-NH₂; (SEQ ID NO: 130) H-Apc-D-Bal-D-Bal-Phe-Apc-NH₂; (SEQ ID NO: 132) H-Apc-D-Bal-D-Bal-Phe-Lys-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-Phe-NH₂; (SEQ ID NO: 140) H-Apc-D-Bal-D-Bal-Taz-Apc-NH₂; (SEQ ID NO: 141) H-Apc-D-Bal-D-Bal-Taz-Lys-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-Taz-NH₂; (SEQ ID NO: 143) H-Apc-D-Bal-D-Trp-2-Fua-Apc-NH₂; (SEQ ID NO: 128) H-Apc-D-Bal-D-Trp-2-Fua-Lys-NH₂; (SEQ ID NO: 144) H-Apc-D-Bal-D-Trp-2-Fua-NH₂; (SEQ ID NO: 144) H-Apc-D-Bal-D-Trp-2-Pal-NH₂; (SEQ ID NO: 144) H-Apc-D-Bal-D-Trp-3-Pal-NH₂; (SEQ ID NO: 143) H-Apc-D-Bal-D-Trp-3-Thi-Apc-NH₂; (SEQ ID NO: 128) H-Apc-D-Bal-D-Trp-3-Thi-Lys-NH₂; (SEQ ID NO: 144) H-Apc-D-Bal-D-Trp-3-Thi-NH₂; (SEQ ID NO: 144) H-Apc-D-Bal-D-Trp-4-Pal-NH₂; (SEQ ID NO: 143) H-Apc-D-Bal-D-Trp-Pff-Apc-NH₂; (SEQ ID NO: 128) H-Apc-D-Bal-D-Trp-Pff-Lys-NH₂; (SEQ ID NO: 144) H-Apc-D-Bal-D-Trp-Pff-NH₂; (SEQ ID NO: 145) H-Inp-D-1-Nal-D-Bal-2-Fua-Lys-NH₂; (SEQ ID NO: 146) H-Inp-D-1-Nal-D-Bal-2-Fua-NH₂; (SEQ ID NO: 145) H-Inp-D-1-Nal-D-Bal-2-Thi-Lys-NH₂; (SEQ ID NO: 145) H-Inp-D-1-Nal-D-Bal-3-Thi-Lys-NH₂;  (SEQ ID NO: 145) H-Inp-D-1-Nal-D-Bal-Pff-Lys-NH₂;  (SEQ ID NO: 146) H-Inp-D-1-Nal-D-Bal-Pff-NH₂;  (SEQ ID NO: 145) H-Inp-D-1-Nal-D-Bal-Phe-Lys-NH₂;  (SEQ ID NO: 145) H-Inp-D-1-Nal-D-Bal-Taz-Lys-NH₂;  (SEQ ID NO: 146) H-Inp-D-1-Nal-D-Bal-Taz-NH₂;  (SEQ ID NO: 147) H-Inp-D-1-Nal-D-Trp-2-Fua-Apc-NH₂; (SEQ ID NO: 112) H-Inp-D-1-Nal-D-Trp-2-Fua-Lys-NH₂;  (SEQ ID NO: 116) H-Inp-D-1-Nal-D-Trp-2-Fua-NH₂;  (SEQ ID NO: 147) H-Inp-D-1-Nal-D-Trp-3-Thi-Apc-NH₂;  (SEQ ID NO: 112) H-Inp-D-1-Nal-D-Trp-3-Thi-Lys-NH₂;  (SEQ ID NO: 147) H-Inp-D-1-Nal-D-Trp-Pff-Apc-NH₂;  (SEQ ID NO: 112) H-Inp-D-1-Nal-D-Trp-Pff-Lys-NH₂;  (SEQ ID NO: 116) H-Inp-D-1-Nal-D-Trp-Pff-NH₂;  (SEQ ID NO: 116) H-Inp-D-1-Nal-D-Trp-Taz-NH₂;  (SEQ ID NO: 148) H-Inp-D-2-Nal-D-Trp-2-Fua-Apc-NH₂;  (SEQ ID NO: 115) H-Inp-D-2-Nal-D-Trp-2-Fua-NH₂;  (SEQ ID NO: 148) H-Inp-D-2-Nal-D-Trp-2-Thi-Apc-NH₂;  (SEQ ID NO: 148) H-Inp-D-2-Nal-D-Trp-3-Thi-Apc-NH₂;  (SEQ ID NO: 113) H-Inp-D-2-Nal-D-Trp-3-Thi-Lys-NH₂;  (SEQ ID NO: 115) H-Inp-D-2-Nal-D-Trp-3-Thi-NH₂;  (SEQ ID NO: 148) H-Inp-D-2-Nal-D-Trp-Pff-Apc-NH₂;  (SEQ ID NO: 115) H-Inp-D-2-Nal-D-Trp-Pff-NH₂;  (SEQ ID NO: 135) H-Inp-D-2-Nal-D-Trp-Taz-Apc-NH₂;  (SEQ ID NO: 115) H-Inp-D-2-Nal-D-Trp-Taz-NH₂;  (SEQ ID NO: 149) H-Inp-D-Bal-D-Bal-2-Fua-Lys-NH₂;  (SEQ ID NO: 150) H-Inp-D-Bal-D-Bal-2-Fua-NH₂;  (SEQ ID NO: 149) H-Inp-D-Bal-D-Bal-2-Thi-Lys-NH₂;  (SEQ ID NO: 149) H-Inp-D-Bal-D-Bal-3-Thi-Lys-NH₂;  (SEQ ID NO: 149) H-Inp-D-Bal-D-Bal-Pff-Lys-NH₂; (SEQ ID NO: 150) H-Inp-D-Bal-D-Bal-Pff-NH₂; (SEQ ID NO: 149) H-Inp-D-Bal-D-Bal-Phe-Lys-NH₂; (SEQ ID NO: 149) H-Inp-D-Bal-D-Bal-Taz-Lys-NH₂; (SEQ ID NO: 150) H-Inp-D-Bal-D-Bal-Taz-NH₂; (SEQ ID NO: 151) H-Inp-D-Bal-D-Trp-2-Fua-Apc-NH₂; (SEQ ID NO: 121) H-Inp-D-Bal-D-Trp-2-Fua-Lys-NH₂; (SEQ ID NO: 152) H-Inp-D-Bal-D-Trp-2-Fua-NH₂; (SEQ ID NO: 151) H-Inp-D-Bal-D-Trp-3-Thi-Apc-NH₂; (SEQ ID NO: 121) H-Inp-D-Bal-D-Trp-3-Thi-Lys-NH₂; (SEQ ID NO: 151) H-Inp-D-Bal-D-Trp-Pff-Apc-NH₂; (SEQ ID NO: 121) H-Inp-D-Bal-D-Trp-Pff-Lys-NH₂; (SEQ ID NO: 152) H-Inp-D-Bal-D-Trp-Pff-NH₂; (SEQ ID NO: 152) H-Inp-D-Bal-D-Trp-Taz-NH₂; (SEQ ID NO: 153) H-Inp-D-Bip-D-Bal-2-Fua-Lys-NH₂; (SEQ ID NO: 154) H-Inp-D-Bip-D-Bal-2-Fua-NH₂; (SEQ ID NO: 153) H-Inp-D-Bip-D-Bal-2-Thi-Lys-NH₂; (SEQ ID NO: 153) H-Inp-D-Bip-D-Bal-3-Thi-Lys-NH₂; (SEQ ID NO: 153) H-Inp-D-Bip-D-Bal-Pff-Lys-NH₂; (SEQ ID NO: 154) H-Inp-D-Bip-D-Bal-Pff-NH₂; or (SEQ ID NO: 153) H-Inp-D-Bip-D-Bal-Taz-Lys-NH₂; (SEQ ID NO: 154) H-Inp-D-Bip-D-Bal-Taz-NH₂; (SEQ ID NO: 155) H-Inp-D-Bip-D-Trp-2-Fua-Lys-NH₂; (SEQ ID NO: 156) H-Inp-D-Bip-D-Trp-2-Fua-NH₂; (SEQ ID NO: 155) H-Inp-D-Bip-D-Trp-2-Thi-Lys-NH₂; (SEQ ID NO: 155) H-Inp-D-Bip-D-Trp-3-Thi-Lys-NH₂; (SEQ ID NO: 155) H-Inp-D-Bip-D-Trp-Pff-Lys-NH₂; (SEQ ID NO: 156) H-Inp-D-Bip-D-Trp-Pff-NH₂; (SEQ ID NO: 155) H-Inp-D-Bip-D-Trp-Taz-Lys-NH₂; or (SEQ ID NO: 156) H-Inp-D-Bip-D-Trp-Taz-NH₂; (SEQ ID NO: 112) H-Inp-D-1-Nal-D-Trp-3-Pal-Lys-NH₂; (SEQ ID NO: 113) H-Inp-D-2-Nal-D-Trp-4-Pal-Lys-NH₂; Example #91 (SEQ ID NO: 113) H-Inp-D-2-Nal-D-Trp-Orn-Lys-NH₂; (SEQ ID NO: 111) H-Inp-D-Bip-D-Trp-Phe-Lys-NH₂; (SEQ ID NO: 113) H-Inp-D-2-Nal-D-Trp-Thr(Bzl)-Lys-NH₂; Example #70 (SEQ ID NO: 113) H-Inp-D-2-Nal-D-Trp-Pff-Lys-NH₂; (SEQ ID NO: 113) H-Inp-D-2-Nal-D-Trp-2-Thi-Lys-NH₂; (SEQ ID NO: 113) H-Inp-D-2-Nal-D-Trp-Taz-Lys-NH₂; (SEQ ID NO: 111) H-Inp-D-Dip-D-Trp-Phe-Lys-NH₂; (SEQ ID NO: 111) H-Inp-D-Bpa-D-Trp-Phe-Lys-NH₂; (SEQ ID NO: 114) H-Inp-D-2-Nal-D-Bpa-Phe-Lys-NH₂; (SEQ ID NO: 115) H-Inp-D-2-Nal-D-Trp-Thr(Bzl)-NH₂; (SEQ ID NO: 115) H-Inp-D-2-Nal-D-Trp-Pff-NH₂; (SEQ ID NO: 115) H-Inp-D-2-Nal-D-Trp-Taz-NH₂; (SEQ ID NO: 118) H-Inp-D-2-Nal-D-Dip-Phe-NH₂; (SEQ ID NO: 113) H-Inp-D-2-Nal-D-Trp-3-Pal-Lys-NH₂; (SEQ ID NO: 120) H-Inp-D-Trp-D-2-Nal(Ψ)-Pim; (SEQ ID NO: 121) H-Inp-D-Bal-D-Trp-2-Thi-Lys-NH₂; (SEQ ID NO: 111) H-Inp-D-Bal-D-Trp-Phe-Lys-NH₂; (SEQ ID NO: 112) H-Inp-D-1-Nal-D-Trp-2-Thi-Lys-NH₂; (SEQ ID NO: 122) H-Inp-D-2-Nal-D-Trp-Phe-Apc-NH₂; (SEQ ID NO: 122) H-Inp-D-1-Nal-D-Trp-Phe-Apc-NH₂; (SEQ ID NO: 122) H-Inp-D-Bal-D-Trp-Phe-Apc-NH₂; (SEQ ID NO: 123) H-Apc-D-2-Nal-D-Trp-Phe-Lys-NH₂; (SEQ ID NO: 124) H-Apc-D-1-Nal-D-Trp-2-Thi-Lys-NH₂; (SEQ ID NO: 126) H-Inp-D-2-Nal-D-Trp(Ψ)-Pim; (SEQ ID NO: 126) H-Inp-D-1-Nal-D-Trp(Ψ)-Pim; (SEQ ID NO: 126) H-Inp-D-Bal-D-Trp(Ψ)-Pim; (SEQ ID NO: 127) H-Aib-D-Ser(Bzl)-D-Trp(T)-Pim; (SEQ ID NO: 112) H-Inp-D-1-Nal-D-Trp-Taz-Lys-NH₂; (SEQ ID NO: 121) H-Inp-D-Bal-D-Trp-Taz-Lys-NH₂; (SEQ ID NO: 124) H-Apc-D-1-Nal-D-Trp-Taz-Lys-NH₂; (SEQ ID NO: 128) H-Apc-D-Bal-D-Trp-Taz-Lys-NH₂; (SEQ ID NO: 128) H-Apc-D-Bal-D-Trp-2-Thi-Lys-NH₂; (SEQ ID NO: 123) H-Apc-D-Bal-D-Trp-Phe-Lys-NH₂; (SEQ ID NO: 129) H-Apc-D-1-Nal-D-Trp-Phe-Apc-NH₂; (SEQ ID NO: 130) H-Apc-D-Bal-D-Trp-Phe-Apc-NH₂; (SEQ ID NO: 129) H-Apc-D-1-Nal-D-1-Nal-Phe-Apc-NH₂; (SEQ ID NO: 129) H-Apc-D-1-Nal-D-2-Nal-Phe-Apc-NH₂; (SEQ ID NO: 131) H-Apc-D-1-Nal-D-1-Nal-Phe-Lys-NH₂; (SEQ ID NO: 130) H-Apc-D-Bal-D-1-Nal-Phe-Apc-NH₂; (SEQ ID NO: 130) H-Apc-D-Bal-D-2-Nal-Phe-Apc-NH₂; (SEQ ID NO: 132) H-Apc-D-Bal-D-1-Nal-Phe-Lys-NH₂; (SEQ ID NO: 132) H-Apc-D-Bal-D-2-Nal-Phe-Lys-NH₂; (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-2-Thi-NH₂; (SEQ ID NO: 157) H-Apc-D-Bal-D-Trp-Phe-NH₂; (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-Taz-NH₂; (SEQ ID NO: 157) H-Apc-D-Bal-D-Trp-2-Thi-NH₂; (SEQ ID NO: 157) H-Apc-D-Bal-D-Trp-Taz-NH₂; (SEQ ID NO: 134) H-Apc-D-2-Nal-D-Trp-2-Thi-NH₂; (SEQ ID NO: 134) H-Apc-D-2-Nal-D-Trp-Taz-NH₂; (SEQ ID NO: 135) H-Inp-D-1-Nal-D-Trp-Taz-Apc-NH₂; (SEQ ID NO: 135) H-Inp-D-Bal-D-Trp-Taz-Apc-NH₂; (SEQ ID NO: 136) H-Apc-D-1-Nal-D-Trp-Taz-Apc-NH₂; (SEQ ID NO: 136) H-Apc-D-Bal-D-Trp-Taz-Apc-NH₂; (SEQ ID NO: 113) H-Inp-D-2-Nal-D-Trp-3-Thi-Lys-NH₂; (SEQ ID NO: 121) H-Inp-D-Bal-D-Trp-3-Thi-Lys-NH₂; (SEQ ID NO: 121) H-Inp-D-Bal-D-Trp-2-Fua-Lys-NH₂; (SEQ ID NO: 121) H-Inp-D-Bal-D-Trp-Pff-Lys-NH₂; (SEQ ID NO: 151) H-Inp-D-Bal-D-Trp-3-Thi-Apc-NH₂; (SEQ ID NO: 151) H-Inp-D-Bal-D-Trp-2-Fua-Apc-NH₂; (SEQ ID NO: 151) H-Inp-D-Bal-D-Trp-Pff-Apc-NH₂; (SEQ ID NO: 128) H-Apc-D-Bal-D-Trp-3-Thi-Lys-NH₂; (SEQ ID NO: 128) H-Apc-D-Bal-D-Trp-2-Fua-Lys-NH₂; (SEQ ID NO: 128) H-Apc-D-Bal-D-Trp-Pff-Lys-NH₂; (SEQ ID NO: 149) H-Inp-D-Bal-D-Bal-Phe-Lys-NH₂; (SEQ ID NO: 149) H-Inp-D-Bal-D-Bal-2-Thi-Lys-NH₂; (SEQ ID NO: 149) H-Inp-D-Bal-D-Bal-3-Thi-Lys-NH₂; (SEQ ID NO: 149) H-Inp-D-Bal-D-Bal-Taz-Lys-NH₂; (SEQ ID NO: 149) H-Inp-D-Bal-D-Bal-2-Fua-Lys-NH₂; (SEQ ID NO: 149) H-Inp-D-Bal-D-Bal-Pff-Lys-NH₂; (SEQ ID NO: 132) H-Apc-D-Bal-D-Bal-Phe-Lys-NH₂; (SEQ ID NO: 141) H-Apc-D-Bal-D-Bal-2-Thi-Lys-NH₂; (SEQ ID NO: 141) H-Apc-D-Bal-D-Bal-3-Thi-Lys-NH₂; (SEQ ID NO: 141) H-Apc-D-Bal-D-Bal-Taz-Lys-NH₂; (SEQ ID NO: 141) H-Apc-D-Bal-D-Bal-2-Fua-Lys-NH₂; (SEQ ID NO: 141) H-Apc-D-Bal-D-Bal-Pff-Lys-NH₂; (SEQ ID NO: 112) H-Inp-D-1-Nal-D-Trp-3-Thi-Lys-NH₂; (SEQ ID NO: 112) H-Inp-D-1-Nal-D-Trp-2-Fua-Lys-NH₂; (SEQ ID NO: 112) H-Inp-D-1-Nal-D-Trp-Pff-Lys-NH₂; (SEQ ID NO: 158) H-Inp-D-1-Nal-D-Bal-Phe-Lys-NH₂; (SEQ ID NO: 158) H-Inp-D-1-Nal-D-Bal-2-Thi-Lys-NH₂; (SEQ ID NO: 158) H-Inp-D-1-Nal-D-Bal-3-Thi-Lys-NH₂; (SEQ ID NO: 158) H-Inp-D-1-Nal-D-Bal-Taz-Lys-NH₂; (SEQ ID NO: 158) H-Inp-D-1-Nal-D-Bal-2-Fua-Lys-NH₂; (SEQ ID NO: 158) H-Inp-D-1-Nal-D-Bal-Pff-Lys-NH₂; (SEQ ID NO: 159) H-Inp-D-2-Nal-D-Trp-2-Thi-Apc-NH₂; (SEQ ID NO: 159) H-Inp-D-2-Nal-D-Trp-3-Thi-Apc-NH₂; (SEQ ID NO: 135) H-Inp-D-2-Nal-D-Trp-Taz-Apc-NH₂; (SEQ ID NO: 159) H-Inp-D-2-Nal-D-Trp-2-Fua-Apc-NH₂; (SEQ ID NO: 159) H-Inp-D-2-Nal-D-Trp-Pff-Apc-NH₂; (SEQ ID NO: 160) H-Inp-D-1-Nal-D-Trp-3-Thi-Apc-NH₂; (SEQ ID NO: 160) H-Inp-D-1-Nal-D-Trp-2-Fua-Apc-NH₂; (SEQ ID NO: 160) H-Inp-D-1-Nal-D-Trp-Pff-Apc-NH₂; (SEQ ID NO: 124) H-Apc-D-1-Nal-D-Trp-3-Thi-Lys-NH₂; (SEQ ID NO: 124) H-Apc-D-1-Nal-D-Trp-2-Fua-Lys-NH₂; (SEQ ID NO: 124) H-Apc-D-1-Nal-D-Trp-Pff-Lys-NH₂; (SEQ ID NO: 139) H-Apc-D-2-Nal-D-Trp-2-Thi-Lys-NH₂; (SEQ ID NO: 139) H-Apc-D-2-Nal-D-Trp-3-Thi-Lys-NH₂; (SEQ ID NO: 139) H-Apc-D-2-Nal-D-Trp-Taz-Lys-NH₂; (SEQ ID NO: 139) H-Apc-D-2-Nal-D-Trp-2-Fua-Lys-NH₂; (SEQ ID NO: 139) H-Apc-D-2-Nal-D-Trp-Pff-Lys-NH₂; (SEQ ID NO: 155) H-Inp-D-Bip-D-Trp-2-Thi-Lys-NH₂; (SEQ ID NO: 155) H-Inp-D-Bip-D-Trp-3-Thi-Lys-NH₂; (SEQ ID NO: 155) H-Inp-D-Bip-D-Trp-Taz-Lys-NH₂; (SEQ ID NO: 155) H-Inp-D-Bip-D-Trp-2-Fua-Lys-NH₂; (SEQ ID NO: 155) H-Inp-D-Bip-D-Trp-Pff-Lys-NH₂; (SEQ ID NO: 153) H-Inp-D-Bip-D-Bal-2-Thi-Lys-NH₂; (SEQ ID NO: 153) H-Inp-D-Bip-D-Bal-3-Thi-Lys-NH₂; (SEQ ID NO: 153) H-Inp-D-Bip-D-Bal-Taz-Lys-NH₂; (SEQ ID NO: 153) H-Inp-D-Bip-D-Bal-2-Fua-Lys-NH₂; (SEQ ID NO: 153) H-Inp-D-Bip-D-Bal-Pff-Lys-NH₂; (SEQ ID NO: 143) H-Apc-D-Bal-D-Trp-3-Thi-Apc-NH₂; (SEQ ID NO: 143) H-Apc-D-Bal-D-Trp-2-Fua-Apc-NH₂; (SEQ ID NO: 143) H-Apc-D-Bal-D-Trp-Pff-Apc-NH₂; (SEQ ID NO: 130) H-Apc-D-Bal-D-Bal-Phe-Apc-NH₂; (SEQ ID NO: 140) H-Apc-D-Bal-D-Bal-2-Thi-Apc-NH₂; (SEQ ID NO: 140) H-Apc-D-Bal-D-Bal-3-Thi-Apc-NH₂; (SEQ ID NO: 140) H-Apc-D-Bal-D-Bal-Taz-Apc-NH₂; (SEQ ID NO: 140) H-Apc-D-Bal-D-Bal-2-Fua-Apc-NH₂; (SEQ ID NO: 140) H-Apc-D-Bal-D-Bal-Pff-Apc-NH₂; (SEQ ID NO: 137) H-Apc-D-1-Nal-D-Trp-3-Thi-Apc-NH₂; (SEQ ID NO: 137) H-Apc-D-1-Nal-D-Trp-2-Fua-Apc-NH₂; (SEQ ID NO: 137) H-Apc-D-1-Nal-D-Trp-Pff-Apc-NH₂; (SEQ ID NO: 138) H-Apc-D-2-Nal-D-Trp-2-Thi-Apc-NH₂; (SEQ ID NO: 138) H-Apc-D-2-Nal-D-Trp-3-Thi-Apc-NH₂; (SEQ ID NO: 136) H-Apc-D-2-Nal-D-Trp-Taz-Apc-NH₂; (SEQ ID NO: 138) H-Apc-D-2-Nal-D-Trp-2-Fua-Apc-NH₂; (SEQ ID NO: 138) H-Apc-D-2-Nal-D-Trp-Pff-Apc-NH₂; (SEQ ID NO: 152) H-Inp-D-Bal-D-Trp-Taz-NH₂; (SEQ ID NO: 152) H-Inp-D-Bal-D-Trp-2-Fua-NH₂; (SEQ ID NO: 152) H-Inp-D-Bal-D-Trp-Pff-NH₂; (SEQ ID NO: 157) H-Apc-D-Bal-D-Trp-3-Thi-NH₂; (SEQ ID NO: 157) H-Apc-D-Bal-D-Trp-2-Fua-NH₂; (SEQ ID NO: 157) H-Apc-D-Bal-D-Trp-Pff-NH₂; (SEQ ID NO: 157) H-Apc-D-Bal-D-Trp-4-Pal-NH₂; (SEQ ID NO: 157) H-Apc-D-Bal-D-Trp-3-Pal-NH₂; (SEQ ID NO: 157) H-Apc-D-Bal-D-Trp-2-Pal-NH₂; (SEQ ID NO: 150) H-Inp-D-Bal-D-Bal-Taz-NH₂; (SEQ ID NO: 150) H-Inp-D-Bal-D-Bal-2-Fua-NH₂; (SEQ ID NO: 150) H-Inp-D-Bal-D-Bal-Pff-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-Phe-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-2-Thi-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-3-Thi-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-Taz-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-2-Fua-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-Pff-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-4-Pal-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-3-Pal-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-2-Pal-NH₂; (SEQ ID NO: 116) H-Inp-D-1-Nal-D-Trp-Taz-NH₂; (SEQ ID NO: 116) H-Inp-D-1-Nal-D-Trp-2-Fua-NH₂; (SEQ ID NO: 116) H-Inp-D-1-Nal-D-Trp-Pff-NH₂; (SEQ ID NO: 161) H-Inp-D-1-Nal-D-Bal-Taz-NH₂; (SEQ ID NO: 161) H-Inp-D-1-Nal-D-Bal-2-Fua-NH₂; (SEQ ID NO: 161) H-Inp-D-1-Nal-D-Bal-Pff-NH₂; (SEQ ID NO: 115) H-Inp-D-2-Nal-D-Trp-Taz-NH₂; (SEQ ID NO: 115) H-Inp-D-2-Nal-D-Trp-2-Fua-NH₂; (SEQ ID NO: 115) H-Inp-D-2-Nal-D-Trp-Pff-NH₂; (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-3-Thi-NH₂; (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-2-Fua-NH₂; (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-Pff-NH₂; (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-4-Pal-NH₂; (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-3-Pal-NH₂; (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-2-Pal-NH₂; (SEQ ID NO: 134) H-Apc-D-2-Nal-D-Trp-3-Thi-NH₂; (SEQ ID NO: 134) H-Apc-D-2-Nal-D-Trp-2-Fua-NH₂; (SEQ ID NO: 134) H-Apc-D-2-Nal-D-Trp-Pff-NH₂; (SEQ ID NO: 134) H-Apc-D-2-Nal-D-Trp-4-Pal-NH₂; (SEQ ID NO: 134) H-Apc-D-2-Nal-D-Trp-3-Pal-NH₂; (SEQ ID NO: 134) H-Apc-D-2-Nal-D-Trp-2-Pal-NH₂; (SEQ ID NO: 156) H-Inp-D-Bip-D-Trp-Taz-NH₂; (SEQ ID NO: 156) H-Inp-D-Bip-D-Trp-2-Fua-NH₂; (SEQ ID NO: 156) H-Inp-D-Bip-D-Trp-Pff-NH₂; (SEQ ID NO: 154) H-Inp-D-Bip-D-Bal-Taz-NH₂; (SEQ ID NO: 154) H-Inp-D-Bip-D-Bal-2-Fua-NH₂; or (SEQ ID NO: 154) H-Inp-D-Bip-D-Bal-Pff-NH₂; (SEQ ID NO: 147) H-Inp-D-1-Nal-D-Trp-2-Thi-Apc-NH₂; Example #24 (SEQ ID NO: 151) H-Inp-D-Bal-D-Trp-2-Thi-Apc-NH₂; Example #9 (SEQ ID NO: 137) H-Apc-D-1-Nal-D-Trp-2-Thi-Apc-NH₂; Example #17 (SEQ ID NO: 143) H-Apc-D-Bal-D-Trp-2-Thi-Apc-NH₂; Example #22 or (SEQ ID NO: 131) H-Apc-D-1-Nal-D-Trp-Phe-Lys-NH₂ Example #13 or a pharmaceutically acceptable salts thereof.

In yet another aspect, the invention provides a method of treating gastrointestinal conditions such as gastroesophageal reflux disease, IBS, constipation, ileus, emesis, gastroparesis, and colonic pseudo-obstruction and the like, by administering a therapeutically effective amount of a peptidyl ghrelin analog according to the following formula (III):

(R²R³)-A¹-A²-A³-A⁴-A⁵-A⁶-A⁷-A⁸-A⁹-A¹⁰-A¹¹-A¹²-A¹³-A¹⁴-A¹⁵-A¹⁶-A¹⁷-A¹⁸-A¹⁹-A²⁰-A²¹-A²²-A²³-A²⁴-A²⁵-A²⁶-A²⁷-A²⁸-R¹

wherein:

A¹ is Gly, Aib, Ala, β-Ala, Acc or Gly(myristyl);

A² is Ser, Aib, Ala, Acc, Abu, Act, Ava, Thr or Val;

A³ is Ser, Ser(C(O)—R⁴), Asp(O—R⁸), Asp(NH—R⁹), Cys(S—R¹⁴), Dap(S(O)₂—R¹⁰, Dab(S(O)₂—R¹¹), Glu(O—R⁶), Glu(NH—R⁷), Thr(C(O)—R⁵) or HN—CH((CH₂)_(n)—N(R¹²R¹³))—C(O);

A⁴ is Phe, Acc, Aic, Cha, 2-Fua, 1-Nal, 2-Nal, 2-Pal, 3-Pal, 4-Pal, hPhe, (X¹,X²,X³,X⁴,X⁵)Phe, Taz, 2-Thi, 3-Thi, Trp or Tyr;

A⁵ is Leu, Abu, Acc, Aib, Ala, Cha, Ile, hLeu, Nle, Nva, Phe, Tle or Val;

A⁶ is Ser, Abu, Acc, Act, Aib, Ala, Gly, Thr or Val;

A⁷ is Pro, Dhp, Dmt, 3-Hyp, 4-Hyp, Inc, Ktp, Oic, Pip, Thz or Tic;

A⁸ is Glu, Acc, Aib, Arg, Asn, Asp, Dab, Dap, Gln, Lys, Orn or HN—CH((CH₂)_(n)—N(R¹²R¹³))—C(O);

A⁹ is His, Apc, Aib, Acc, 2-Fua, 2-Pal, 3-Pal, 4-Pal, Taz, 2-Thi, 3-Thi or (X¹,X²,X³,X⁴,X⁵-)Phe;

A¹⁰ is Gln, Acc, Aib, Asn, Asp or Glu;

A¹¹ is Arg, Apc, hArg, Dab, Dap, Lys, Orn or HN—CH((CH₂)_(n)—N(R¹²R¹³))—C(O);

A¹² is Val, Abu, Acc, Aib, Ala, Cha, Nva, Gly, Ile, Leu, Nle, Tle or Cha;

A¹³ is Gln, Acc, Aib, Asn, Asp or Glu;

A¹⁴ is Gln, Acc, Aib, Asn, Asp or Glu;

A¹⁵ is Arg, hArg, Acc, Aib, Apc, Dab, Dap, Lys, Orn, Ser(C(O)—R⁴), Thr(C(O)—R⁵), Glu(O—R⁶), Glu(NH—R⁷), Asp(O—R⁸), Asp(NH—R⁹), Dap(S(O)₂—R¹⁰), Dab(S(O)₂—R¹¹), HN—CH((CH₂)_(n)—N(R¹²R¹³)—C(O), Cys(S—R¹⁴), Cys(R¹⁵), hCys(S—R¹⁶) or hCys(R¹⁷);

A¹⁶ is Lys, Acc, Aib, Apc, Arg, hArg, Dab, Dap, Orn, Ser(C(O)—R⁴), Thr(C(O)—R⁵), Glu(O—R⁶), Glu(NH—R⁷), Asp(O—R⁸), Asp(NH—R⁹), Dap(S(O)₂—R¹⁰), Dab(S(O)₂—R¹¹), HN—CH((CH₂)_(n)—N(R¹²R¹³))—C(O), Cys(S—R¹⁴), Cys(R¹⁵), hCys(S—R¹⁶), hCys(R¹⁷) or deleted;

A¹⁷ is Glu, Arg, Asn, Asp, Dab, Dap, Gln, Lys, Orn, Ser(C(O)—R⁴), Thr(C(O)—R⁵), Glu(O—R⁶), Glu(NH—R⁷), Asp(O—R⁸), Asp(NH—R⁹), Dap(S(O)₂—R¹⁰), Dab(S(O)₂—R¹¹), HN—CH((CH₂)_(n)—N(R¹²R¹³))—C(O), Cys(S—R¹⁴), Cys(R¹⁵), hCys(S—R¹⁶), hCys(R¹⁷), Lys(biotinyl) or deleted;

A¹⁸ is Ser, Abu, Acc, Act, Aib, Ala, Thr, Val, Ser(C(O)—R⁴), Thr(C(O)—R⁵), Glu(O—R⁶), Glu(NH—R⁷), Asp(O—R⁸), Asp(NH—R⁹), Dap(S(O)₂—R¹⁰), Dab(S(O)₂—R¹¹), HN—CH((CH₂)_(n)—N(R¹²R¹³))—C(O), Cys(S—R¹⁴), Cys(R¹⁵), hCys(S—R¹⁶), hCys(R¹⁷) or deleted;

A¹⁹ is Lys, Acc, Aib, Apc, Arg, hArg, Dab, Dap, Orn, Ser(C(O)—R⁴), Thr(C(O)—R⁵), Glu(O—R⁶), Glu(NH—R⁷), Asp(O—R⁸), Asp(NH—R⁹), Dap(S(O)₂—R¹⁰), Dab(S(O)₂—R¹¹), HN—CH((CH₂)_(n)—N(R¹²R¹³)—C(O), Cys(S—R¹⁴), Cys(R¹⁵), hCys(S—R¹⁶), hCys(R¹⁷) or deleted;

A²⁰ is Lys, Acc, Aib, Apc, Arg, hArg, Dab, Dap, Orn, Ser(C(O)—R⁴), Thr(C(O)—R⁵), Glu(O—R⁶), Glu(NH—R⁷), Asp(O—R⁸), Asp(NH—R⁹), Dap(S(O)₂—R¹⁰), Dab(S(O)₂—R¹¹), HN—CH((CH₂)_(n)—N(R¹²R¹³)—C(O), Cys(S—R¹⁴), Cys(R¹⁵), hCys(S—R¹⁶), hCys(R¹⁷) or deleted;

A²¹ is Pro, Dhp, Dmt, Inc, 3-Hyp, 4-Hyp, Ktp, Oic, Pip, Thz, Tic or deleted;

A²² is Pro, Dhp, Dmt, 3-Hyp, 4-Hyp, Inc, Ktp, Oic, Pip, Thz, Tic or deleted;

A²³ is Abu, Acc, Act, Aib, Ala, Apc, Gly, Nva, Val or deleted;

A²⁴ is Lys, Acc, Aib, Apc, Arg, hArg, Dab, Dap, Orn, HN—CH((CH₂)_(n)—N(R¹²R¹³))—C(O) or deleted;

A²⁵ is Leu, Abu, Acc, Aib, Ala, Cha, Ile, hLeu, Nle, Nva, Phe, Tle, Val or deleted;

A²⁶ is Gln, Aib, Asn, Asp, Glu or deleted;

A²⁷ is Pro, Dhp, Dmt, 3-Hyp, 4-Hyp, Inc, Ktp, Oic, Pip, Thz, Tic or deleted;

A²⁸ is Acc, Aib, Apc, Arg, hArg, Dab, Dap, Lys, Orn, HN—CH((CH₂)_(n)—N(R¹²R¹³))—C(O) or deleted;

R¹ is —OH, —NH₂, —(C₁-C₃₀)alkoxy or NH—X⁶—CH₂—Z⁰, wherein X⁶ is a (C₁-C₁₂)alkyl, (C₂-C₁₂)alkenyl and Z⁰ is —H, —OH, —CO₂H or —C(O)—NH₂;

R² and R³ is, independently for each occurrence thereof, selected from the group consisting of H, (C₁-C₃₀)alkyl, (C₁-C₃₀)heteroalkyl, (C₁-C₃₀)acyl, (C₂-C₃₀)alkenyl, (C₂-C₃₀)alkynyl, aryl(C₁-C₃₀)alkyl, aryl(C₁-C₃₀)acyl, substituted (C₁-C₃₀)alkyl, substituted (C₁-C₃₀)heteroalkyl, substituted (C₂-C₃₀)acyl, substituted (C₂-C₃₀)alkenyl, substituted aryl(C₁-C₃₀)alkyl and substituted aryl(C₁-C₃₀)acyl;

R⁴, R⁵, R⁶, R⁷, R⁸, R⁹, R¹⁰, R¹¹, R¹⁴, R¹⁵, R¹⁶ and R¹⁷ is, independently for each occurrence thereof, selected from the group consisting of (C₁-C₄₀)alkyl, (C₂-C₄₀)alkenyl, substituted (C₁-C₄₀)alkyl, substituted (C₂-C₄₀)alkenyl, alkylaryl, substituted alkylaryl, aryl and substituted aryl;

R¹² and R¹³ is, independently for each occurrence thereof, selected from the group consisting of H, (C₁-C₄₀)alkyl, (C₁-C₄₀)acyl, (C₁-C₃₀)alkylsulfonyl, biotinyl and —C(NH)—NH₂,

X¹, X², X³, X⁴, and X⁵ is, independently for each occurrence thereof, selected from the group consisting of H, F, Cl, Br, I, (C₁₋₁₀)alkyl, substituted (C₁₋₁₀)alkyl, aryl, substituted aryl, OH, NH₂, NO₂ and CN; and

n is, independently for each occurrence thereof, 1, 2, 3, 4 or 5;

provided that:

(I). when R² is (C₁-C₃₀)acyl, aryl(C₁-C₃₀)acyl, substituted (C₂-C₃₀)acyl, or substituted aryl(C₁-C₃₀)acyl, R³ is H, (C₁-C₃₀)alkyl, (C₁-C₃₀)heteroalkyl, (C₂-C₃₀)alkenyl, aryl(C₁-C₃₀)alkyl, substituted (C₁-C₃₀)alkyl, substituted (C₁-C₃₀)heteroalkyl, substituted (C₂-C₃₀)alkenyl or substituted aryl(C₁-C₃₀)alkyl;

(II). when R¹² is (C₁-C₄₀)acyl, (C₁-C₃₀)alkylsulfonyl, biotinyl or —C(NH)—NH₂, then R¹³ is H or (C₁-C₄₀)alkyl;

(III). at least one of A¹⁵, A¹⁶, A¹⁷, A¹⁸, A¹⁹ or A²⁰ must be selected from the group consisting of Ser(C(O)—R⁴), Thr(C(O)—R⁵), Glu(O—R⁶), Glu(NH—R⁷), Asp(O—R⁸), Asp(NH—R⁹), Dap(S(O)₂—R¹⁰), Dab(S(O)₂—R¹¹), HN—CH((CH₂)_(n)—N(R¹²R¹³))—C(O), Cys(S—R¹⁴), Cys(R¹⁵), hCys(S—R¹⁶) and hCys(R¹⁷); and

(IV). when any of the group consisting of A¹⁵, A¹⁶, A¹⁷, A¹⁹ and A²⁰ is HN—CH((CH₂)_(n)—N(R¹²R¹³))—C(O), then R¹² must be biotinyl;

or a pharmaceutically acceptable salt thereof.

In yet another aspect, the invention provides a preferred group of compounds according to formula (III), where in:

each of R² and R³ is, independently for each occurrence thereof, selected from the group consisting of H, acyl, n-butyryl, isobutyryl and n-octanoyl;

R⁴ is heptyl;

R⁶ is hexyl;

R⁷ is hexyl;

R¹⁰ is octyl;

R¹¹ is heptyl; and

provided that when Acc is substituted for one of the naturally-occurring residues, it is, independently for each occurrence, A3c, A4c, A5c or A6c; or pharmaceutically acceptable salts thereof.

In yet another aspect, the invention provides a preferred group of compounds according to formula (III), where the compound is:

(SEQ ID NO: 162) (Ser(n-octanoyl)¹⁵hGhrelin(1-28)-NH₂; (SEQ ID NO: 163) (Glu(NH-hexyl)¹⁵hGhrelin(1-28)-NH₂; (SEQ ID NO: 164) (Glu(NH-hexyl)³,¹⁵hGhrelin(1-28)-NH₂; (SEQ ID NO: 165) (Glu(NH-hexyl)³, Ser(n-octanoyl)¹⁵hGhrelin(1-28)- NH₂; (SEQ ID NO: 166) (Aib², Glu(NH-hexyl)¹⁵hGhrelin(1-28)-NH₂; (SEQ ID NO: 167) (Aib², Glu(NH-hexyl)³,¹⁵hGhrelin(1-28)-NH₂; (SEQ ID NO: 168) (Aib^(2,8), Glu(NH-hexyl)¹⁵hGhrelin(1-28)-NH₂; (SEQ ID NO: 169) (Aib^(2,8), Glu(NH-hexyl)^(3,15)hGhrelin(1-28)-NH₂; (SEQ ID NO: 170) (Aib^(2,10), Glu(NH-hexyl)¹⁵hGhrelin(1-28)-NH₂; (SEQ ID NO: 171) (Aib^(2,10), Glu(NH-hexyl)^(3,15)hGhrelin(1-28)-NH₂; (SEQ ID NO: 172) (Ser(n-octanoyl)¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 173) (Glu(NH-hexyl)¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 174) (Glu(NH-hexyl)^(3,16))hGhrelin(1-28)-NH₂; (SEQ ID NO: 175) (Glu(NH-hexyl)³, Ser(n-octanoyl)¹⁶)hGhrelin(1-28)- NH₂; (SEQ ID NO: 176) (Aib², Glu(NH-hexyl)¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 177) (Aib², Glu(NH-hexyl)^(3,16))hGhrelin(1-28)-NH₂; (SEQ ID NO: 178) (Aib^(2,8), Glu(NH-hexyl)¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 179) (Aib^(2,8), Glu(NH-hexyl)^(3,16))hGhrelin(1-28)-NH₂; (SEQ ID NO: 180) (Aib^(2,10), Glu(NH-hexyl)¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 181) (Aib^(2,10), Glu(NH-hexyl)^(3,16))hGhrelin(1-28)-NH₂; (SEQ ID NO: 182) (Ser(n-octanoyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 183) (Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 184) (Glu(NH-hexyl)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 185) (Glu(NH-hexyl)³, Ser(n-octanoyl)¹⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 186) (Dap(octanesulfonyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 187) (Dap(octanesulfonyl)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 188) (Dap(octanesulfonyl)³, Glu(NH-hexyl)¹⁷)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 189) (Dap(octanesulfonyl)³, Ser(n-octanoyl)¹⁷)hGhrelin (1-28)-NH₂; (SEQ ID NO: 190) (Glu(NH-hexyl)³, Dap(octanesulfonyl)¹⁷)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 191) (Cys(S-(CH₂)₉CH₃)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 192) (Cys(S-(CH₂)₉CH₃)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 193) (Glu(NH-hexyl)³, Cys(S-(CH₂)₉CH₃)¹⁷)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 194) (Cys(S-(CH₂)₉CH₃)³, Glu(NH-hexyl)¹⁷)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 195) (Cys(S-(CH₂)₉CH₃)³, Ser(n-octanoyl)¹⁷)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 196) (Aib², Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 197) (Aib², Glu(NH-hexyl)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 198) (Aib², Thz⁷, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 198) (Aib², 4-Hyp⁷, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 198) (Aib², Dhp⁷, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 198) (Aib², Pip⁷, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 198) (Aib², Tic⁷, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 199) (Aib², Glu(NH-hexyl)^(3,17), Thz⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 200) (Aib², Glu(NH-hexyl)^(3,17), 4-Hyp⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 200) (Aib², Glu(NH-hexyl)^(3,17), Dhp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 200) (Aib², Glu(NH-hexyl)^(3,17), Pip⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 200) (Aib², Glu(NH-hexyl)^(3,17), Tic⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 201) (Aib^(2,8), Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 202) (Aib^(2,8), Glu(NH-hexyl)^(3,17))hGhrelin(1-28)-NH₂; Example #16 (SEQ ID NO: 203) (Aib², 3-Pal⁹, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 203) (Aib², 4-Pal⁹, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 203) (Aib², Taz⁹, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 203) (Aib², 2-Thi⁹, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 204) (Aib², Glu(NH-hexyl)^(3,17), 3-Pal⁹)hGhrelin(1-28)- NH₂; (SEQ ID NO: 204) (Aib², Glu(NH-hexyl)^(3,17), 4-Pal⁹)hGhrelin(1-28)- NH₂; (SEQ ID NO: 204) (Aib², Glu(NH-hexyl)^(3,17), Taz⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 204) (Aib², Glu(NH-hexyl)^(3,17), 2-Thi⁹)hGhrelin(1-28)- NH₂; (SEQ ID NO: 205) (Aib^(2,10), Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 206) (Aib^(2,10), Glu(NH-hexyl)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 207) (Aib⁸, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 208) (Taz⁹, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 208) (3-Pal⁹, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 208) (4-Pal⁹, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 208) (2-Thi⁹, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 209) (Glu(NH-hexyl)^(3,17), Aib⁸)hGhrelin(1-28)-NH₂; (SEQ ID NO: 210) (Glu(NH-hexyl)^(3,17), Taz⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 210) (Glu(NH-hexyl)^(3,17), 3-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 210) (Glu(NH-hexyl)^(3,17), 4-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 210) (Glu(NH-hexyl)^(3,17), 2-Thi⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 211) (Aib^(1,2,10), Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 212) (Aib^(1,2,10), Glu(NH-hexyl)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 196) (A5c², Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 197) (A5c², Glu(NH-hexyl)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 184) (Glu(1-heptanol)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 213) (Asp(1-heptanol)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 184) (Glu(NH-hexyl)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 213) (Asp(NH-hexyl)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 197) (Aib², Glu(NH-hexyl)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 214) (Lys(biotinyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 215) (Ser(n-octanoyl)¹⁸)hGhrelin(1-28)-NH₂; (SEQ ID NO: 216) (Glu(NH-hexyl)¹⁸)hGhrelin(1-28)-NH₂; (SEQ ID NO: 217) (Glu(NH-hexyl)^(3,18))hGhrelin(1-28)-NH₂; (SEQ ID NO: 218) (Glu(NH-hexyl)³, Ser(n-octanoyl)¹⁸)hGhrelin(1-28)- NH₂; (SEQ ID NO: 219) (Aib², Glu(NH-hexyl)¹⁸)hGhrelin(1-28)-NH₂; (SEQ ID NO: 220) (Aib², Glu(NH-hexyl)^(3,18))hGhrelin(1-28)-NH₂; (SEQ ID NO: 221) (Aib^(2,8), Glu(NH-hexyl)¹⁸)hGhrelin(1-28)-NH₂; (SEQ ID NO: 222) (Aib^(2,8), Glu(NH-hexyl)^(3,18))hGhrelin(1-28)-NH₂; (SEQ ID NO: 223) (Aib^(2,10), Glu(NH-hexyl)¹⁸)hGhrelin(1-28)-NH₂; (SEQ ID NO: 224) (Aib^(2,10), Glu(NH-hexyl)^(3,18))hGhrelin(1-28)-NH₂; (SEQ ID NO: 225) (Ser(n-octanoyl)¹⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 226) (Glu(NH-hexyl)¹⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 227) (Glu(NH-hexyl)^(3,19))hGhrelin(1-28)-NH₂; (SEQ ID NO: 228) (Glu(NH-hexyl)³, Ser(n-octanoyl)¹⁹)hGhrelin(1-28)- NH₂; (SEQ ID NO: 229) (Aib², Glu(NH-hexyl)¹⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 230) (Aib², Glu(NH-hexyl)^(3,19))hGhrelin(1-28)-NH₂; (SEQ ID NO: 231) (Aib^(2,8), Glu(NH-hexyl)¹⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 232) (Aib^(2,8), Glu(NH-hexyl)^(3,19))hGhrelin(1-28)-NH₂; (SEQ ID NO: 233) (Aib^(2,10), Glu(NH-hexyl)¹⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 234) (Aib^(2,10), Glu(NH-hexyl)^(3,19))hGhrelin(1-28)-NH₂; (SEQ ID NO: 235) (Ser(n-octanoyl)²⁰)hGhrelin(1-28)-NH₂; (SEQ ID NO: 236) (Glu(NH-hexyl)²⁰)hGhrelin(1-28)-NH₂; (SEQ ID NO: 237) (Glu(NH-hexyl)^(3,20))hGhrelin(1-28)-NH₂; (SEQ ID NO: 238) (Glu(NH-hexyl)³, Ser(n-octanoyl)²⁰)hGhrelin(1-28)- NH₂; (SEQ ID NO: 239) (Aib², Glu(NH-hexyl)²⁰)hGhrelin(1-28)-NH₂; (SEQ ID NO: 240) (Aib², Glu(NH-hexyl)^(3,20))hGhrelin(1-28)-NH₂; (SEQ ID NO: 241) (Aib^(2,8), Glu(NH-hexyl)²⁰)hGhrelin(1-28)-NH₂; (SEQ ID NO: 242) (Aib^(2,8), Glu(NH-hexyl)^(3,20))hGhrelin(1-28)-NH₂; (SEQ ID NO: 243) (Aib^(2,10), Glu(NH-hexyl)²⁰)hGhrelin(1-28)-NH₂; (SEQ ID NO: 244) (Aib^(2,10), Glu(NH-hexyl)^(3,20))hGhrelin(1-28)-NH₂; (SEQ ID NO: 245) (Ac-Gly¹, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 246) (Ac-Gly¹, Ser(n-octanoyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 247) (Ac-Gly¹, Glu(NH-hexyl)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 248) (Ac-Gly¹, Glu(NH-hexyl)³, Ser(n-octanoyl)¹⁷) hGhrelin(1-28)-NH₂; (SEQ ID NO: 249) (Ac-Gly¹, Dap(octanesulfonyl)¹⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 250) (Ac-Gly¹, Dap(octanesulfonyl)^(3,17))hGhrelin(1-28)- NH₂; (SEQ ID NO: 251) (Ac-Gly¹, Dap(octanesulfonyl)³, Glu(NH-Hexyl)¹⁷) hGhrelin(1-28)-NH₂; (SEQ ID NO: 252) (Ac-Gly¹, Dap(octanesulfonyl)³, Ser(n-octanoyl)¹⁷) hGhrelin(1-28)-NH₂; (SEQ ID NO: 253) (Ac-Gly¹, Glu(NH-hexyl)³, Dap(octanesulfonyl)¹⁷) hGhrelin(1-28)-NH₂; (SEQ ID NO: 254) (Ac-Gly¹, Cys(S-(CH₂)₉CH₃)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 255) (Ac-Gly¹, Cys(S-(CH₂)₉CH₃)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 256) (Ac-Gly¹, Glu(NH-hexyl)³, Cys(S-(CH₂)₉CH₃3)¹⁷) hGhrelin(1-28)-NH₂; (SEQ ID NO: 257) (Ac-Gly¹,Cys(S-(CH₂)₉CH₃)³, Glu(NH-hexyl)¹⁷) hGhrelin(1-28)-NH₂; (SEQ ID NO: 258) (Ac-Gly¹, Cys(S-(CH₂)₉CH₃)³, Ser(n-octanoyl)¹⁷) hGhrelin(1-28)-NH₂; (SEQ ID NO: 259) (Ac-Gly¹, Aib², Glu(NH-hexyl)¹⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 260) (Ac-Gly¹, Aib², Thz⁷, Glu(NH-hexyl)¹⁷)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 260) (Ac-Gly¹, Aib², 4-Hyp⁷, Glu(NH-hexyl)¹⁷)hGhrelin (1-28)-NH₂; (SEQ ID NO: 260) (Ac-Gly¹, Aib², Dhp⁷, Glu(NH-hexyl)¹⁷)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 260) (Ac-Gly¹, Aib², Pip⁷, Glu(NH-hexyl)¹⁷)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 260) (Ac-Gly¹, Aib², Tic⁷, Glu(NH-hexyl)¹⁷)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 261) (Ac-Gly¹, Aib², Glu(NH-hexyl)^(3,17), Thz⁷)hGhrelin (1-28)-NH₂; (SEQ ID NO: 261) (Ac-Gly¹, Aib², Glu(NH-hexyl)^(3,17), 4-Hyp⁷)hGhrelin (1-28)-NH₂; (SEQ ID NO: 261) (Ac-Gly¹, Aib², Glu(NH-hexyl)^(3,17), Dhp⁷)hGhrelin (1-28)-NH₂; (SEQ ID NO: 261) (Ac-Gly¹, Aib², Glu(NH-hexyl)^(3,17), Pip⁷)hGhrelin (1-28)-NH₂; (SEQ ID NO: 261) (Ac-Gly¹, Aib², Glu(NH-hexyl)^(3,17), Tic⁷)hGhrelin (1-28)-NH₂; (SEQ ID NO: 262) (Ac-Gly¹, Aib^(2,8), Glu(NH-hexyl)¹⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 263) (Ac-Gly¹, Aib², 3-Pal⁹, Glu(NH-hexyl)¹⁷)hGhrelin (1-28)-NH₂; (SEQ ID NO: 263) (Ac-Gly¹, Aib², 4-Pal⁹, Glu(NH-hexyl)¹⁷)hGhrelin (1-28)-NH₂; (SEQ ID NO: 263) (Ac-Gly¹, Aib², Taz⁹, Glu(NH-hexyl)¹⁷)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 263) (Ac-Gly¹, Aib², 2-Thi⁹, Glu(NH-hexyl)¹⁷)hGhrelin (1-28)-NH₂; (SEQ ID NO: 264) (Ac-Gly¹, Aib², Glu(NH-hexyl)^(3,17), 3-Pal⁹)hGhrelin (1-28)-NH₂; (SEQ ID NO: 264) (Ac-Gly¹, Aib², Glu(NH-hexyl)^(3,17), 4-Pal⁹)hGhrelin (1-28)-NH₂; (SEQ ID NO: 264) (Ac-Gly¹, Aib², Glu(NH-hexyl)^(3,17), Taz⁹)hGhrelin (1-28)-NH₂; (SEQ ID NO: 264) (Ac-Gly¹, Aib², Glu(NH-hexyl)^(3,17), 2-Thi⁹)hGhrelin (1-28)-NH₂; (SEQ ID NO: 265) (Ac-Gly¹, Aib^(2,10), Glu(NH-hexyl)¹⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 266) (Ac-Gly¹, Aib^(2,10), Glu(NH-hexyl)^(3,17))hGhrelin(1- 28)-NH₂; (SEQ ID NO: 267) (Ac-Gly¹, Aib⁸, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 268) (Ac-Gly¹, Taz⁹, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 268) (Ac-Gly¹, 3-Pal⁹, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 268) (Ac-Gly¹, 4-Pal⁹, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 268) (Ac-Gly¹, 2-Thi⁹, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 269) (Ac-Gly¹, Glu(NH-hexyl)^(3,17), Aib⁸)hGhrelin(1-28)- NH₂; (SEQ ID NO: 270) (Ac-Gly¹, Glu(NH-hexyl)^(3,17), Taz⁹)hGhrelin(1-28)- NH₂; (SEQ ID NO: 270) (Ac-Gly¹, Glu(NH-hexyl)^(3,17), 3-Pal⁹)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 270) (Ac-Gly¹, Glu(NH-hexyl)^(3,17), 4-Pal⁹)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 270) (Ac-Gly¹, Glu(NH-hexyl)^(3,17), 2-Thi⁹)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 271) (Ac-Aib¹, Aib^(2,10), Glu(NH-hexyl)¹⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 272) (Ac-Aib¹, Aib^(2,10), Glu(NH-hexyl)^(3,17))hGhrelin(1- 28)-NH₂; (SEQ ID NO: 259) (Ac-Gly¹, A5c², Glu(NH-hexyl)¹⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 273) (Ac-Gly¹, A5c², Glu(NH-hexyl)^(3,17))hGhrelin(1-28)- NH₂; (SEQ ID NO: 247) (Ac-Gly¹, Glu(1-heptanol)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 274) (Ac-Gly¹, Asp(1-heptanol)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 247) (Ac-Gly¹, Glu(NH-hexyl)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 274) (Ac-Gly¹, Asp(NH-hexyl)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 275) (Ac-Gly¹, Aib^(2,10), Glu(NH-hexyl)³, Lys (biotinyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 276) (Ac-Gly¹, Glu(NH-hexyl)¹⁵hGhrelin(1-28)-NH₂; (SEQ ID NO: 277) (Ac-Gly¹, Ser(n-octanoyl)¹⁵hGhrelin(1-28)-NH₂; (SEQ ID NO: 278) (Ac-Gly¹, Glu(NH-hexyl)³,¹⁵hGhrelin(1-28)-NH₂; (SEQ ID NO: 279) (Ac-Gly¹, Glu(NH-hexyl)³, Ser(n-octanoyl)¹⁵ hGhrelin(1-28)-NH₂; (SEQ ID NO: 280) (Ac-Gly¹, Aib², Glu(NH-hexyl)¹⁵hGhrelin(1-28)- NH₂; (SEQ ID NO: 281) (Ac-Gly¹, Aib², Glu(NH-hexyl)³,¹⁵hGhrelin(1-28)- NH₂; (SEQ ID NO: 282) (Ac-Gly¹, Aib^(2,8), Glu(NH-hexyl)¹⁵hGhrelin(1-28)- NH₂; (SEQ ID NO: 283) (Ac-Gly¹, Aib^(2,8), Glu(NH-hexyl)³,¹⁵hGhrelin(1- 28)-NH₂; (SEQ ID NO: 284) (Ac-Gly¹, Aib^(2,10), Glu(NH-hexyl)¹⁵hGhrelin(1-28)- NH₂; (SEQ ID NO: 285) (Ac-Gly¹, Aib^(2,10), Glu(NH-hexyl)³,¹⁵hGhrelin(1- 28)-NH₂; (SEQ ID NO: 286) (Ac-Gly¹, Glu(NH-hexyl)¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 287) (Ac-Gly¹, Ser(n-octanoyl)¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 288) (Ac-Gly¹, Glu(NH-hexyl)^(3,16))hGhrelin(1-28)-NH₂; (SEQ ID NO: 289) (Ac-Gly¹, Glu(NH-hexyl)³, Ser(n-octanoyl)¹⁶) hGhrelin(1-28)-NH₂; (SEQ ID NO: 290) (Ac-Gly¹, Aib², Glu(NH-hexyl)¹⁶)hGhrelin(1-28)- NH₂; (SEQ ID NO: 291) (Ac-Gly¹, Aib², Glu(NH-hexyl)^(3,16))hGhrelin(1-28)- NH₂; (SEQ ID NO: 292) (Ac-Gly¹, Aib^(2,8), Glu(NH-hexyl)¹⁶)hGhrelin(1-28)- NH₂; (SEQ ID NO: 293) (Ac-Gly¹, Aib^(2,8), Glu(NH-hexyl)^(3,16))hGhrelin(1- 28)-NH₂; (SEQ ID NO: 294) (Ac-Gly¹, Aib^(2,10), Glu(NH-hexyl)¹⁶)hGhrelin(1-28)- NH₂; (SEQ ID NO: 295) (Ac-Gly¹, Aib^(2,10), Glu(NH-hexyl)^(3,16))hGhrelin(1- 28)-NH₂; (SEQ ID NO: 296) (Ac-Gly¹, Glu(NH-hexyl)¹⁸)hGhrelin(1-28)-NH₂; (SEQ ID NO: 297) (Ac-Gly¹, Ser(n-octanoyl)¹⁸)hGhrelin(1-28)-NH₂; (SEQ ID NO: 298) (Ac-Gly¹, Glu(NH-hexyl)^(3,18))hGhrelin(1-28)-NH₂; (SEQ ID NO: 299) (Ac-Gly¹, Glu(NH-hexyl)³, Ser(n-octanoyl)¹⁸) hGhrelin(1-28)-NH₂; (SEQ ID NO: 300) (Ac-Gly¹, Aib², Glu(NH-hexyl)¹⁸)hGhrelin(1-28)- NH₂; (SEQ ID NO: 301) (Ac-Gly¹, Aib², Glu(NH-hexyl)^(3,18))hGhrelin(1-28)- NH₂; (SEQ ID NO: 302) (Ac-Gly¹, Aib^(2,8), Glu(NH-hexyl)¹⁸)hGhrelin(1-28)- NH₂; (SEQ ID NO: 303) (Ac-Gly¹, Aib^(2,8), Glu(NH-hexyl)^(3,18))1-IGhrelin(1- 28)-NH₂; (SEQ ID NO: 304) (Ac-Gly¹, Aib^(2,10), Glu(NH-hexyl)¹⁸)hGhrelin(1-28)- NH₂; (SEQ ID NO: 305) (Ac-Gly¹, Aib^(2,10), Glu(NH-hexyl)^(3,18))1-IGhrelin(1- 28)-NH₂; (SEQ ID NO: 306) (Ac-Gly¹, Glu(NH-hexyl)¹⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 307) (Ac-Gly¹, Ser(n-octanoyl)¹⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 308) (Ac-Gly¹, Glu(NH-hexyl)^(3,19))hGhrelin(1-28)-NH₂; (SEQ ID NO: 309) (Ac-Gly¹, Glu(NH-hexyl)³, Ser(n-octanoyl)¹⁹) hGhrelin(1-28)-NH₂; (SEQ ID NO: 310) (Ac-Gly¹, Aib², Glu(NH-hexyl)¹⁹)hGhrelin(1-28)- NH₂; (SEQ ID NO: 311) (Ac-Gly¹, Aib², Glu(NH-hexyl)^(3,19))hGhrelin(1-28)- NH₂; (SEQ ID NO: 312) (Ac-Gly¹, Aib^(2,8), Glu(NH-hexyl)¹⁹)hGhrelin(1-28)- NH₂; (SEQ ID NO: 313) (Ac-Gly¹, Aib^(2,8), Glu(NH-hexyl)^(3,19))hGhrelin(1- 28)-NH₂; (SEQ ID NO: 314) (Ac-Gly¹, Aib^(2,10), Glu(NH-hexyl)¹⁹)hGhrelin(1-28)- NH₂; (SEQ ID NO: 315) (Ac-Gly¹, Aib^(2,10), Glu(NH-hexyl)^(3,19))hGhrelin(1- 28)-NH₂; (SEQ ID NO: 316) (Ac-Gly¹, Glu(NH-hexyl)²⁰)hGhrelin(1-28)-NH₂; (SEQ ID NO: 317) (Ac-Gly¹, Ser(n-octanoyl)²⁰)hGhrelin(1-28)-NH₂; (SEQ ID NO: 318) (Ac-Gly¹, Glu(NH-hexyl)^(3,20))hGhrelin(1-28)-NH₂; (SEQ ID NO: 319) (Ac-Gly¹, Glu(NH-hexyl)³, Ser(n-octanoyl)²⁰) hGhrelin(1-28)-NH₂; (SEQ ID NO: 320) (Ac-Gly¹, Aib², Glu(NH-hexyl)²⁰)hGhrelin(1-28)- NH₂; (SEQ ID NO: 321) (Ac-Gly¹, Aib², Glu(NH-hexyl)^(3,20))hGhrelin(1-28)- NH₂; (SEQ ID NO: 322) (Ac-Gly¹, Aib^(2,8), Glu(NH-hexyl)²⁰)hGhrelin(1-28)- NH₂; (SEQ ID NO: 323) (Ac-Gly¹, Aib^(2,8), Glu(NH-hexyl)^(3,20))hGhrelin(1- 28)-NH₂; (SEQ ID NO: 324) (Ac-Gly¹, Aib^(2,10), Glu(NH-hexyl)²⁰)hGhrelin(1-28)- NH₂; (SEQ ID NO: 325) (Ac-Gly¹, Aib^(2,10), Glu(NH-hexyl)^(3,20))hGhrelin(1- 28)-NH₂; or pharmaceutically acceptable salts thereof.

In yet another aspect, the invention provides a method of treating gastrointestinal conditions such as gastroesophageal reflux disease, IBS, constipation, ileus, emesis, gastroparesis, and colonic pseudo-obstruction and the like, by administering a therapeutically effective amount of the following peptidyl ghrelin analogs which do not correspond to any one of formula (I), (II) or (III):

(SEQ ID NO: 326) (Asp³(NH-heptyl))hGhrelin(1-28)-NH₂ Example #86 (SEQ ID NO: 327) (des-Ser²)hGhrelin(1-28)-NH₂; Example #104 or (SEQ ID NO: 328) (des-Gly¹, des-Ser²)hGhrelin(1-28)-NH₂; Example #117 (SEQ ID NO: 329) (Aib¹)hGhrelin(1-28)-NH₂; Example #6 (SEQ ID NO: 326) (Asp³(O-hexyl))hGhrelin(1-28)-NH₂; Example #40 (SEQ ID NO: 329) (Aib¹, Ser³)hGhrelin(1-28)-NH₂;  (SEQ ID NO: 3) (A5c⁵, Ser³)hGhrelin(1-28)-NH₂;  (SEQ ID NO: 330) (Aib^(2,4), Ser³, 4-Pal⁹)hGhrelin(1-28)-NH₂;  (SEQ ID NO: 95) (n-octanoyl-Gly¹, Ser³)hGhrelin(1-28)-NH₂;  (SEQ ID NO: 95) (isobutyryl-Gly¹, Ser³)hGhrelin(1-28)-NH₂;  (SEQ ID NO: 95) (n-butyryl-Gly¹, Ser³)hGhrelin(1-28)-NH₂;  (SEQ ID NO: 331) (Aib¹, Thr³)hGhrelin(1-28)-NH₂;  (SEQ ID NO: 330) (Aib^(2,4), Thr³, 4-Pal⁹)hGhrelin(1-28)-NH₂;  (SEQ ID NO: 332) (n-octanoyl-Gly¹, Thr³)hGhrelin(1-28)-NH₂;  (SEQ ID NO: 332) (isobutyryl-Gly¹, Thr³)hGhrelin(1-28)-NH₂;  (SEQ ID NO: 332) (n-butyryl-Gly¹, Thr³)hGhrelin(1-28)-NH₂;  (SEQ ID NO: 95) (Ac-Gly¹)hGhrelin(1-28)-NH₂;  (SEQ ID NO: 95) (Ac-Gly¹, Ser³)hGhrelin(1-28)-NH₂,  (SEQ ID NO: 333) Aib², Lys(Myristyl)¹⁷)hGhrelin-(1-28)-NH₂; or  (SEQ ID NO: 334) Gly(myristyl)¹-(Aib², Lys(Myristyl)¹⁷]hGhrelin- (1-28)-NH₂;  or pharmaceutically acceptable salts thereof.

The peptidyl analog of ghrelin or prodrug thereof may be administered parenterally, e.g., administered intravenously, subcutaneously, or by implantation of a sustained release formulation. The peptide analog of ghrelin may also be administered intracerebroventricular (icy) injection. In another embodiment, the peptidyl analog of ghrelin is administered via oral administration. Particularly preferred peptidyl analogs of ghrelin are those compounds of formula (I) or formula (II) or formula (III), as well as the non-conforming compounds indicated above, as well as each of the compounds that are specifically enumerated herein and below in the Examples section of the present disclosure, or a pharmaceutically acceptable salt thereof.

Accordingly, in one aspect, the invention features a method of treating ileus in a patient, which includes identifying a patient suffering from or at risk for ileus and administering to the patient a pharmaceutical composition comprising an effective amount of a peptidyl analog of ghrelin. Particularly preferred peptidyl analogs of ghrelin are those compounds of formula (I) or formula (II) or formula (III), as well as the non-conforming compounds indicated above and each of the compounds that are specifically enumerated herein and below in the Examples section of the present disclosure, or a pharmaceutically acceptable salt thereof.

In another aspect, the invention features a method of treating post-surgical ileus in a patient. The method includes identifying a patient suffering from post-surgical ileus and administering to the patient a pharmaceutical composition comprising an effective amount of a peptidyl analog of ghrelin effective to treat ileus in the patient. The ileus can be ileus of any part of the gastrointestinal tract, e.g., the stomach, small intestine, and/or large intestine (e.g., the colon). The pharmaceutical composition can be administered to the patient via any route described herein, e.g., via inhalation (of gaseous compositions); orally; and/or by direct administration to the abdominal cavity of the patient. Particularly preferred peptidyl analogs of ghrelin are those compounds of formula (I) or formula (II) or formula (III), as well as the non-conforming compounds indicated above and each of the compounds that are specifically enumerated herein and below in the Examples section of the present disclosure, or a pharmaceutically acceptable salt thereof.

The invention also features a method of treating ileus in a patient suffering from or at risk for ileus not caused by abdominal surgery, e.g., ileus caused by any factor described herein other than abdominal surgery. The method includes identifying a patient suffering from or at risk for ileus not caused by abdominal surgery and administering to the patient a pharmaceutical composition comprising an effective amount of a peptidyl analog of ghrelin effective to treat ileus in the patient. Particularly preferred peptidyl analogs of ghrelin are those compounds of formula (I) or formula (II) or formula (III), as well as the non-conforming compounds indicated above and each of the compounds that are specifically enumerated herein and below in the Examples section of the present disclosure, or a pharmaceutically acceptable salt thereof.

In yet another aspect, the invention provides a method of performing surgery on a patient. The method includes identifying a patient in need of surgery, and before, during, and/or after the surgery, administering to the patient an effective amount of a peptidyl analog of ghrelin sufficient to treat ileus in the patient. The surgery can be any surgery that causes and/or puts the patient at risk for ileus. For example, the surgery can involve manipulation (e.g., touching (directly or indirectly)) of the gastrointestinal tract, e.g., the stomach and/or intestines, e.g., small or large intestine (e.g., the colon), and can be a surgery involving laparotomy or not involving laparotomy (e.g., surgeries involving laparoscopy). In certain embodiments, the surgery can be transplant surgery or non-transplant surgery, e.g., surgery involving any organ(s) or tissue(s) in the abdomen, e.g., surgery of the urogenital system (e.g., kidneys, ureter, and/or bladder; and reproductive organs (e.g., uterus, ovaries, and/or fallopian tubes)); the digestive system (e.g., the stomach, small intestine, large intestine (e.g., the colon), appendix, gallbladder, liver, spleen, and/or pancreas); the lymphatic system; the respiratory system (e.g., the lungs); the diaphragm; surgery to treat cancer of any organ or tissue within the abdomen; endometrial surgery; and orthopedic surgeries, e.g., hip surgery. Particularly preferred peptidyl analogs of ghrelin are those compounds of formula (I) or formula (II) or formula III as well as each of the compounds that are specifically enumerated herein and below in the Examples section of the present disclosure, or a pharmaceutically acceptable salt thereof.

In still another aspect, the invention provides a method of treating ileus in a patient, which includes identifying a patient suffering from or at risk for ileus and administering to the patient an effective amount of a peptidyl analog of ghrelin for treatment or prevention of ileus. Particularly preferred peptidyl analogs of ghrelin are those compounds of formula (I) or formula (II) or formula (III), as well as the non-conforming compounds indicated above and each of the compounds that are specifically enumerated herein and below in the Examples section of the present disclosure, or a pharmaceutically acceptable salt thereof.

In another aspect, the invention features a method of treating emesis in a patient, which includes identifying a patient suffering from or at risk for emesis and administering to the patient a pharmaceutical composition comprising an effective amount of a peptidyl analog of ghrelin. Particularly preferred peptidyl analogs of ghrelin are those compounds of formula (I) or formula (II) or formula (III), as well as the non-conforming compounds indicated above and each of the compounds that are specifically enumerated herein and below in the Examples section of the present disclosure, or a pharmaceutically acceptable salt thereof.

In yet another aspect, the invention features a method of treating emesis provoked by or associated with the administration of anti-cancer chemotherapeutic agents in a patient, which includes identifying a patient suffering from or at risk for emesis provoked by or associated with the administration of anti-cancer chemotherapeutic agents and administering to the patient a pharmaceutical composition comprising a therapeutically effective amount of a peptidyl analog of ghrelin. Particularly preferred peptidyl analogs of ghrelin are those compounds of formula (I) or formula (II) or formula (III), as well as the non-conforming compounds indicated above and each of the compounds that are specifically enumerated herein and below in the Examples section of the present disclosure, or a pharmaceutically acceptable salt thereof.

In another aspect, the invention features a method of treating gastroparesis in a patient, which includes identifying a patient suffering from or at risk for gastroparesis and administering to the patient a pharmaceutical composition comprising an effective amount of a peptidyl analog of ghrelin. Particularly preferred peptidyl analogs of ghrelin are those compounds of formula (I) or formula (II) or formula (III), as well as the non-conforming compounds indicated above and each of the compounds that are specifically enumerated herein and below in the Examples section of the present disclosure, or a pharmaceutically acceptable salt thereof.

In yet another aspect, the invention features a method of treating gastroparesis resulting from diabetes in a patient, which includes identifying a patient suffering from or at risk for diabetic gastroparesis and administering to the patient a pharmaceutical composition comprising an effective amount of a peptidyl analog of ghrelin. The diabetes may be Type I or Type II diabetes. Particularly preferred peptidyl analogs of ghrelin are those compounds of formula (I) or formula (II) or formula (III), as well as the non-conforming compounds indicated above and each of the compounds that are specifically enumerated herein and below in the Examples section of the present disclosure, or a pharmaceutically acceptable salt thereof.

In a further aspect, the present invention provides the use of a therapeutically effective amount of a peptidyl ghrelin analog compound according formula (I) or formula (II) or formula (III) as defined hereinabove, as well as the non-conforming compounds indicated above and each of the compounds specifically enumerated herein and below, or pharmaceutically acceptable salts thereof, for the manufacture of a medicament useful to treat gastrointestinal conditions such as gastroesophageal reflux disease, IBS, constipation, ileus, emesis, gastroparesis, and colonic pseudo-obstruction and the like. In yet another embodiment, the gastrointestinal conditions treated are ileus, emesis and gastroparesis. In yet another embodiment, the ilieus is post-operative ileus, the emesis is associated with the administration of anti-cancer chemotherapeutic agents and the gastroparesis is associated with diabetes.

In yet another aspect, the present invention provides a method of eliciting an agonist or an antagonist effect from a ghrelin receptor in a subject in need thereof which comprises administering to said subject an effective amount of a compound of formula (I) or formula (II) or formula (III) as defined hereinabove, as well as the non-conforming compounds indicated above and each of the compounds specifically enumerated herein and below or pharmaceutically acceptable salts thereof.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1: shows the schematic presentation of the methods used to study gastric emptying in a rat model;

FIG. 2: shows the effect on gastric emptying in normal rats for native ghrelin and Example 19;

FIG. 3: shows the percent decrease in gastric emptying due to post-operative ileus alone and in combination with morphine; and

FIG. 4: shows the effect on gastric emptying in post-operative ileus rat model for native ghrelin and Example 19;

FIG. 5: shows the effect on gastric emptying in post-operative ileus and morphine rat model for native ghrelin and Example 19.

DETAILED DESCRIPTION

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Suitable methods and materials are described below, although methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All publications, patent applications, patents, and other references mentioned herein are incorporated by reference in their entirety. In case of conflict, the present specification, including definitions, will control. The materials, methods, and examples are illustrative only and not intended to be limiting.

Other features and advantages of the invention will be apparent from the following description of the preferred embodiments and from the claims. Certain amino acids present in compounds of the invention can be and are represented herein as follows:

NOMENCLATURE AND ABBREVIATIONS

Symbol Meaning Abu α-aminobutyric acid Acc 1-amino-1-cyclo(C₃-C₉)alkyl carboxylic acid A3c 1-amino-1-cyclopropanecarboxylic acid A4c 1-amino-1-cyclobutanecarboxylic acid A5c 1-amino-1-cyclopentanecarboxylic acid A6c 1-amino-1-cyclohexanecarboxylic acid Act

Aib α-aminoisobutyric acid Aic 2-aminoindan-2-carboxylic acid Ala or A alanine β-Ala beta-alanine Apc

Arg or R arginine hArg homoarginine Asn or N asparagine Asp or D aspartic acid Ava 5-amino-n-valeric acid D-Bal

D-Bip

D-Bpa

Cha β-cyclohexylalanine Cys or C cysteine hCys L-homocysteine Dab 2,4-diaminobutyric acid Dap 2,3-diaminopropionic acid Dap(octanoyl)

Dhp 3,4-dehydroproline Dip

Dmt 5,5-dimethylthiazolidine-4-carboxylic acid 2-Fua β-(2-furyl)-alanine Gln or Q glutamine Glu or E glutamic acid Gly or G glycine His or H histidine 3-Hyp trans-3-hydroxy-L-proline, i.e., (2S,3S)-3-hydroxypyrrolidine-2-carboxylic acid 4-Hyp 4-hydroxyproline, i.e., (2S,4R)-4-hydroxypyrrolidine-2-carboxylic acid Ile or I isoleucine Inc indoline-2-carboxylic acid Inp isonipecotic acid Ktp 4-ketoproline Leu or L leucine hLeu homoleucine Lys or K lysine Lys (biotinyl)

Met or M methionine 1-Nal β-(1-naphthyl)-L-alanine 2-Nal β-(2-naphthyl)-L-alanine Nle norleucine Nva norvaline Oic octahydroindole-2-carboxylic acid Orn ornithine 2-Pal β-(2-pyridiyl)alanine 3-Pal β-(3-pyridiyl)alanine 4-Pal β-(4-pyridiyl)alanine Phe or F phenylalanine hPhe homophenylalanine Pff

Pip pipecolic acid Pim

Pro or P proline Ser or S serine Taz

2-Thi β-(2-thienyl)alanine 3-Thi β-(3-thienyl)alanine Thr or T threonine Thz thiazolidine-4-carboxylic acid Tic 1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid Tle tert-leucine Trp or W tryptophan Tyr or Y tyrosine Val or V valine

When a non-amino acid imidazole moiety (e.g., Pim, defined above) is present at the C-terminus of a compound of the invention, it is understood that the imidazole moiety is attached to the adjacent amino acid via a pseudo-peptide bond (ψ), wherein a bond is form between the position 2 carbon of the imidazole ring and the alpha carbon of the amino acid. For example, in the case where the adjacent amino acid is D-tryptophan (D-Trp) and the imidazole moiety is Pim, the C-terminus of the peptide would appear as follows:

As used herein, Acc encompasses an amino acid selected from the group of 1-amino-1-cyclopropanecarboxylic acid (A3c); 1-amino-1-cyclobutanecarboxylic acid (A4c); 1-amino-1-cyclopentanecarboxylic acid (A5c); 1-amino-1-cyclohexanecarboxylic acid (A6c); 1-amino-1-cycloheptanecarboxylic acid (A7c); 1-amino-1-cyclooctanecarboxylic acid (A8c); and 1-amino-1-cyclononanecarboxylic acid (A9c).

As used herein, a “peptidyl analog of ghrelin” encompasses ghrelin analogues and peptidyl analogs thereof which can be used to practice the therapeutic method of the present invention including, but not limited to, the following compounds:

(SEQ ID NO: 1) (Dap³(Octanesulfonyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 2) (Aib², A6c⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 3) (A6c⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 4) (Aib^(2,6))hGhrelin(1-28)-NH₂; (SEQ ID NO: 5) (Aib², A5c¹²)hGhrelin(1-28)-NH₂; (SEQ ID NO: 6) (Aib², A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 7) (Aib², A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 4) (Aib², Act⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 8) (Aib², 3-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 9) (Aib², Dmt⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 9) (Aib², Thz⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 10) (A5c²)hGhrelin(1-28)-NH₂; (SEQ ID NO: 10) (Act²)hGhrelin(1-28)-NH₂; (SEQ ID NO: 2) (Aib², A5c⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 2) (Aib², A6c⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 2) (Aib²,5)hGhrelin(1-28)-NH₂; (SEQ ID NO: 2) (Aib², hLeu⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 2) (Aib², Cha⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 4) (Aib^(2,6))hGhrelin(1-28)-NH₂; (SEQ ID NO: 4) (Aib², Act⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 4) (Aib², Thr⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 4) (Aib², Abu⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 9) (Aib², 4-Hyp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 9) (Aib², Thz⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 9) (Aib², Pip⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 9) (Aib², Dhp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 9) (Aib², Ktp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 11) (Aib^(2,8))hGhrelin(1-28)-NH₂; (SEQ ID NO: 8) (Aib², 2-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 8) (Aib², 3-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 8) (Aib², 4-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 8) (Aib², Taz⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 8) (Aib², 2-Thi⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 8) (Aib², 2-Fua⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 8) (Aib², Apc⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 8) (Aib^(2,9))hGhrelin(1-28)-NH₂; (SEQ ID NO: 12) (Aib^(2,10))hGhrelin(1-28)-NH₂; (SEQ ID NO: 9) (Aib², Tic⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 13) (Aib⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 3) (A5c⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 3) (A6c⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 13) (Act⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 14) (3-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 15) (Dmt⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 15) (Thz⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 3) (Aib⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 3) (hLeu⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 3) (Cha⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 13) (Thr⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 13) (Abu⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 15) (4-Hyp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 15) (Pip⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 15) (Dhp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 15) (Ktp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 16) (Aib⁸)hGhrelin(1-28)-NH₂; (SEQ ID NO: 14) (2-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 14) (4-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 14) (Taz⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 14) (2-Thi⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 14) (2-Fua⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 14) (Apc⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 14) (Aib⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 17) (Aib¹⁰)hGhrelin(1-28)-NH₂; (SEQ ID NO: 18) (Aib², Dap³(Octanesulfonyl), A6c⁵)hGhrelin(1-28)- NH₂; (SEQ ID NO: 19) (Dap³(Octanesulfonyl), A6c⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 20) (Aib^(2,6), Dap³(Octanesulfonyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 21) (Aib², Dap³(Octanesulfonyl), A5c¹²)hGhrelin(1-28)- NH₂; (SEQ ID NO: 22) (Aib², Dap³(Octanesulfonyl), A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 23) (Aib², Dap³(Octanesulfonyl), A5c¹², Apc¹⁶)hGhrelin (1-28)-NH₂; (SEQ ID NO: 20) (Aib², Dap³(Octanesulfonyl), Act⁶)hGhrelin(1-28)- NH₂; (SEQ ID NO: 24) (Aib², Dap³(Octanesulfonyl), 3-Pal⁹)hGhrelin (1-28)-NH₂; (SEQ ID NO: 25) (Aib², Dap³(Octanesulfonyl), Dmt⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 25) (Aib², Dap³(Octanesulfonyl), Thz⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 26) (A5c², Dap³(Octanesulfonyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 26) (Act², Dap³(Octanesulfonyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 18) (Aib², Dap³(Octanesulfonyl), A5c⁵)hGhrelin(1-28)- NH₂; (SEQ ID NO: 18) (Aib^(2,5), Dap³(Octanesulfonyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 18) (Aib², Dap³(Octanesulfonyl), hLeu⁵)hGhrelin(1-28)- NH₂; (SEQ ID NO: 18) (Aib², Dap³(Octanesulfonyl), Cha⁵)hGhrelin(1-28)- NH₂; (SEQ ID NO: 20) (Aib^(2,6), Dap³(Octanesulfonyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 20) (Aib², Dap³(Octanesulfonyl), Thr⁶)hGhrelin(1-28)- NH₂; (SEQ ID NO: 20) (Aib², Dap³(Octanesulfonyl), Abu⁶)hGhrelin(1-28)- NH₂; (SEQ ID NO: 25) (Aib², Dap³(Octanesulfonyl), 4-Hyp⁷)hGhrelin (1-28)-NH₂; (SEQ ID NO: 25) (Aib², Dap³(Octanesulfonyl), Pip⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 25) (Aib², Dap³(Octanesulfonyl), Dhp⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 25) (Aib², Dap³(Octanesulfonyl), Ktp⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 27) (Aib^(2,8), Dap³(Octanesulfonyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 24) (Aib², Dap³(Octanesulfonyl), 2-Pal⁹)hGhrelin (1-28)-NH₂; (SEQ ID NO: 24) (Aib², Dap³(Octanesulfonyl), 3-Pal⁹)hGhrelin (1-28)-NH₂; (SEQ ID NO: 24) (Aib², Dap³(Octanesulfonyl), 4-Pal⁹)hGhrelin (1-28)-NH₂; (SEQ ID NO: 24) (Aib², Dap³(Octanesulfonyl), Taz⁹)hGhrelin(1-28)- NH₂; (SEQ ID NO: 24) (Aib², Dap³(Octanesulfonyl), 2-Thi⁹)hGhrelin (1-28)-NH₂; (SEQ ID NO: 24) (Aib², Dap³(Octanesulfonyl), 2-Fua⁹)hGhrelin (1-28)-NH₂; (SEQ ID NO: 24) (Aib², Dap³(Octanesulfonyl), Apc⁹)hGhrelin(1-28)- NH₂; (SEQ ID NO: 24) (Aib^(2,9), Dap³(Octanesulfonyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 28) (Aib^(2,10), Dap³(Octanesulfonyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 19) (Dap³(Octanesulfonyl), A6c⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 29) (Dap³(Octanesulfonyl), Aib⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 30) (Dap³(Octanesulfonyl), A5c¹²)hGhrelin(1-28)-NH₂; (SEQ ID NO: 31) (Dap³(Octanesulfonyl), A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 32) (Dap³(Octanesulfonyl), A5c¹²,Apc¹⁶)hGhrelin(1-28)- NH₂; (SEQ ID NO: 29) (Dap³(Octanesulfonyl), Act⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 33) (Dap³(Octanesulfonyl), 3-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 34) (Dap³(Octanesulfonyl), Dmt⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 34) (Dap³(Octanesulfonyl), Thz⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 19) (Dap³(Octanesulfonyl), A5c⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 19) (Dap³(Octanesulfonyl), Aib⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 19) (Dap³(Octanesulfonyl), hLeu⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 19) (Dap³(Octanesulfonyl), Cha⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 29) (Dap³(Octanesulfonyl), Thr⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 29) (Dap³(Octanesulfonyl), Abu⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 34) (Dap³(Octanesulfonyl), 4-Hyp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 34) (Dap³(Octanesulfonyl), Pip⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 34) (Dap³(Octanesulfonyl), Dhp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 34) (Dap³(Octanesulfonyl), Ktp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 35) (Dap³(Octanesulfonyl), Aib⁸)hGhrelin(1-28)-NH₂; (SEQ ID NO: 33) (Dap³(Octanesulfonyl), 2-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 33) (Dap³(Octanesulfonyl), 3-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 33) (Dap³(Octanesulfonyl), 4-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 33) (Dap³(Octanesulfonyl), Taz⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 33) (Dap³(Octanesulfonyl), 2-Thi⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 33) (Dap³(Octanesulfonyl), 2-Fua⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 33) (Dap³(Octanesulfonyl), Apc⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 33) (Dap³(Octanesulfonyl), Aib⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 36) (Dap³(Octanesulfonyl), Aib¹⁰)hGhrelin(1-28)-NH₂; (SEQ ID NO: 31) (Dap³(Octanesulfonyl), A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 31) (Dab3(Octanesulfonyl), A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 37) (Aib², A6c⁵, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 38) (A6c⁵, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 39) (Aib^(2,6), A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 39) (Aib², Act⁶, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 40) (Aib², 3-Pal⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 41) (Aib², Dmt⁷, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 41) (Aib², Thz⁷, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 37) (Aib², A5c⁵, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 37) (Aib²,5, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 37) (Aib², hLeu⁵, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 37) (Aib², Cha⁵, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 39) (Aib^(2,6), A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 39) (Aib², Thr⁶, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 39) (Aib², Abu⁶, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 41) (Aib², 4-Hyp⁷, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 41) (Aib², Pip⁷, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 41) (Aib², Dhp⁷, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 41) (Aib², Ktp⁷, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 42) (Aib^(2,8), A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 40) (Aib², 2-Pal⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 40) (Aib², 3-Pal⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 40) (Aib², 4-Pal⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 40) (Aib², Taz⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 40) (Aib², 2-Thi⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 40) (Aib², 2-Fua⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 40) (Aib², Apc⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 40) (Aib^(2,9), A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 43) (Aib^(2,10), A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 32) (Dap³(Octanesulfonyl), A5c¹², Apc¹⁶)hGhrelin (1-28)-NH₂; (SEQ ID NO: 32) (Dab3(Octanesulfonyl), A5c¹², Apc¹⁶)hGhrelin (1-28)-NH₂; (SEQ ID NO: 44) (Aib², A6c⁵, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 45) (A6c⁵, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 46) (Aib^(2,6), A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 46) (Aib², Act⁶, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 47) (Aib², 3-Pal⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 48) (Aib², Dmt⁷, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 48) (Aib², Thz⁷, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 44) (Aib², A5c⁵,12, Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 44) (Aib^(2,5), A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 44) (Aib², hLeu⁵, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 44) (Aib², Cha⁵, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 46) (Aib^(2,6), A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 46) (Aib², Thr⁶, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 46) (Aib², Abu⁶, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 48) (Aib², 4-Hyp⁷, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 48) (Aib², Pip⁷, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 48) (Aib², Dhp⁷, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 48) (Aib², Ktp⁷, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 49) (Aib^(2,8), A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 47) (Aib², 2-Pal⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 47) (Aib², 3-Pal⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 47) (Aib², 4-Pal⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 47) (Aib², Taz⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 47) (Aib², 2-Thi⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 47) (Aib², 2-Fua⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 47) (Aib², Apc⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 47) (Aib^(2,9), A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 50) (Aib^(2,10), A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 38) (A6c⁵, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 51) (Aib⁶, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 51) (Act⁶, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 52) (3-Pal⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 53) (Dmt⁷, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 53) (Thz⁷, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 38) (A5c⁵, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 38) (Aib⁵, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 38) (hLeu⁵, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 38) (Cha⁵, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 51) (Aib⁶, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 51) (Thr⁶, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 51) (Abu⁶, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 53) (4-Hyp⁷, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 53) (Pip⁷, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 53) (Dhp⁷, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 53) (Ktp⁷, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 54) (Aib⁸, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 52) (2-Pal⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 52) (3-Pal⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 52) (4-Pal⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 52) (Taz⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 52) (2-Thi⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 52) (2-Fua⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 52) (Apc⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 52) (Aib⁹, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 55) (Aib¹⁰, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 56) (Aib⁶, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 45) (A5c⁵, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 56) (Act⁶, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 57) (3-Pal⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 58) (Dmt⁷, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 58) (Thz⁷, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 45) (Aib⁵, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 45) (hLeu⁵, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 45) (Cha⁵, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 56) (Thr⁶, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 56) (Abu⁶, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 58) (4-Hyp⁷, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 58) (Pip⁷, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 58) (Dhp⁷, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 58) (Ktp⁷, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 59) (Aib⁸, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 57) (2-Pal⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 57) (3-Pal⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 57) (4-Pal⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 57) (Taz⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 57) (2-Thi⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 57) (2-Fua⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 57) (Apc⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 57) (Aib⁹, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 60) (Aib¹⁰, A5c¹², Apc¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 61) (Aib², Glu³(NH-Hexyl), A6c⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 62) (Glu³(NH-Hexyl), A6c⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 63) (Aib^(2,6), Glu³(NH-Hexyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 63) (Aib², Glu³(NH-Hexyl), Act⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 64) (Aib², Glu³(NH-Hexyl), 3-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 65) (Aib², Glu³(NH-Hexyl), Dmt⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 65) (Aib², Glu³(NH-Hexyl), Thz⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 61) (Aib², Glu³(NH-Hexyl), A5c⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 61) (Aib^(2,5), Glu³(NH-Hexyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 61) (Aib², Glu³(NH-Hexyl), hLeu⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 2) (Aib², Cha⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 63) (Aib^(2,6), Glu³(NH-Hexyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 63) (Aib², Glu³(NH-Hexyl), Thr⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 63) (Aib², Glu³(NH-Hexyl), Abu⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 65) (Aib², Glu³(NH-hexyl), 4-Hyp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 65) (Aib², Glu³(NH-Hexyl), Pip⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 65) (Aib², Glu³(NH-Hexyl), Dhp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 65) (Aib², Glu³(NH-Hexyl), Ktp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 27) (Aib^(2,8), Glu³(NH-Hexyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 64) (Aib², Glu³(NH-Hexyl), 2-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 64) (Aib², Glu³(NH-Hexyl), 3-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 64) (Aib², Glu³(NH-Hexyl), 4-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 64) (Aib², Glu³(NH-Hexyl), Taz⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 64) (Aib², Glu³(NH-Hexyl), 2-Thi⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 64) (Aib², Glu³(NH-Hexyl), 2-Fua⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 64) (Aib², Glu³(NH-Hexyl), Apc⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 64) (Aib^(2,9), Glu³(NH-Hexyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 28) (Aib^(2,10), Glu³(NH-Hexyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 66) (Glu³(NH-Hexyl), Aib⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 62) (Glu³(NH-Hexyl), A5c⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 66) (Glu³(NH-Hexyl), Act⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 67) (Glu³(NH-Hexyl), 3-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 68) (Glu³(NH-Hexyl), Dmt⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 68) (Glu³(NH-Hexyl), Thz⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 62) (Glu³(NH-Hexyl), Aib⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 62) (Glu³(NH-Hexyl), hLeu⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 62) (Glu³(NH-Hexyl), Cha⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 66) (Glu³(NH-Hexyl), Thr⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 66) (Glu³(NH-Hexyl), Abu⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 68) (Glu³(NH-Hexyl), 4-Hyp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 68) (Glu³(NH-Hexyl), Pip⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 68) (Glu³(NH-Hexyl), Dhp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 68) (Glu³(NH-Hexyl), Ktp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 35) (Glu³(NH-hexyl), Aib⁸)hGhrelin(1-28)-NH₂; (SEQ ID NO: 67) (Glu³(NH-Hexyl), 2-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 67) (Glu³(NH-Hexyl), 3-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 67) (Glu³(NH-Hexyl), 4-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 67) (Glu³(NH-Hexyl), Taz⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 67) (Glu³(NH-Hexyl), 2-Thi⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 67) (Glu³(NH-Hexyl), 2-Fua⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 67) (Glu³(NH-Hexyl), Apc⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 67) (Glu³(NH-Hexyl), Aib⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 36) (Glu³(NH-Hexyl), Aib¹⁰)hGhrelin(1-28)-NH₂; (SEQ ID NO: 69) (Aib², Glu³(NH-Hexyl), A6c⁵, A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 70) (A6c⁵, Glu³(NH-Hexyl), A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 71) (Aib^(2,6), Glu³(NH-Hexyl), A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 71) (Aib², Glu³(NH-Hexyl), Act⁶, A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 72) (Aib², Glu³(NH-Hexyl), 3-Pal⁹, A5c¹², Orn¹⁵) hGhrelin(1-28)-NH₂; (SEQ ID NO: 73) (Aib², Glu³(NH-Hexyl), Dmt⁷, A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 73) (Aib², Glu³(NH-Hexyl), Thz⁷, A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 69) (Aib², Glu³(NH-Hexyl), A5c⁵, A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 69) (Aib^(2,5), Glu³(NH-Hexyl), A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 37) (Aib², hLeu⁵, A5c¹², Orn¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 69) (Aib², Glu³(NH-Hexyl), Cha⁵, A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 71) (Aib^(2,6), Glu³(NH-Hexyl), A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 71) (Aib², Glu³(NH-Hexyl), Thr⁶, A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 71) (Aib², Glu³(NH-Hexyl), Abu⁶, A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 73) (Aib², Glu³(NH-Hexyl), 4-Hyp⁷, A5c¹², Orn¹⁵) hGhrelin(1-28)-NH₂; (SEQ ID NO: 73) (Aib², Glu³(NH-Hexyl), Pip⁷, A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 73) (Aib², Glu³(NH-Hexyl), Dhp⁷, A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 73) (Aib², Glu³(NH-Hexyl), Ktp⁷, A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 74) (Aib^(2,8), Glu³(NH-Hexyl), A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 72) (Aib², Glu³(NH-Hexyl), 2-Pal⁹, A5c¹², Orn¹⁵) hGhrelin(1-28)-NH₂; (SEQ ID NO: 72) (Aib², Glu³(NH-Hexyl), 3-Pal⁹, A5c¹², Orn¹⁵) hGhrelin(1-28)-NH₂; (SEQ ID NO: 72) (Aib², Glu³(NH-Hexyl), 4-Pal⁹, A5c¹², Orn¹⁵) hGhrelin(1-28)-NH₂; (SEQ ID NO: 72) (Aib², Glu³(NH-Hexyl), Taz⁹, A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 72) (Aib², Glu³(NH-Hexyl), 2-Thi⁹, A5c¹², Orn¹⁵) hGhrelin(1-28)-NH₂; (SEQ ID NO: 72) (Aib², Glu³(NH-Hexyl), 2-Fua⁹, A5c¹², Orn¹⁵) hGhrelin(1-28)-NH₂; (SEQ ID NO: 72) (Aib², Glu³(NH-Hexyl), Apc⁹, A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 72) (Aib^(2,9), Glu³(NH-Hexyl), A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 75) (Aib^(2,12), Glu³(NH-Hexyl), 4-Pal⁹, Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 76) (Aib^(2,10), Glu³(NH-Hexyl), A5c¹², Orn¹⁵)hGhrelin (1-28)-NH₂; (SEQ ID NO: 77) (Aib², Glu³(NH-Hexyl), A6c⁵, A5c¹², Apc¹⁶)hGhrelin (1-28)-NH₂; (SEQ ID NO: 78) (Glu³(NH-Hexyl), A6c⁵, A5c¹², Apc¹⁶)hGhrelin (1-28)-NH₂; (SEQ ID NO: 79) (Aib^(2,6), Glu³(NH-Hexyl), A5c¹², Apc¹⁶)hGhrelin (1-28)-NH₂; (SEQ ID NO: 79) (Aib², Glu³(NH-Hexyl), Act⁶, A5c¹², Apc¹⁶) hGhrelin(1-28)-NH₂; (SEQ ID NO: 80) (Aib², Glu³(NH-Hexyl), 3-Pal⁹, A5c¹², Apc¹⁶) hGhrelin(1-28)-NH₂; (SEQ ID NO: 81) (Aib², Glu³(NH-Hexyl), Dmt⁷, A5c¹², Apc¹⁶)hGhrelin (1-28)-NH₂; (SEQ ID NO: 81) (Aib², Glu³(NH-Hexyl), Thz⁷, A5c¹², Apc¹⁶)hGhrelin (1-28)-NH₂; (SEQ ID NO: 77) (Aib², Glu³(NH-Hexyl), A5c^(5,12), Apc¹⁶)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 77) (Aib^(2,5), Glu³(NH-Hexyl), A5c¹², Apc¹⁶)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 77) (Aib², Glu³(NH-Hexyl), hLeu⁵, A5c¹², Apc¹⁶) hGhrelin(1-28)-NH₂; (SEQ ID NO: 77) (Aib², Glu³(NH-Hexyl), Cha⁵, A5c¹², Apc¹⁶)hGhrelin (1-28)-NH₂; (SEQ ID NO: 79) (Aib^(2,6), Glu³(NH-Hexyl), A5c¹², Apc¹⁶)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 79) (Aib², Glu³(NH-Hexyl), Thr⁶, A5c¹², Apc¹⁶)hGhrelin (1-28)-NH₂; (SEQ ID NO: 79) (Aib², Glu³(NH-Hexyl), Abu⁶, A5c¹², Apc¹⁶)hGhrelin (1-28)-NH₂; (SEQ ID NO: 81) (Aib², Glu³(NH-Hexyl), 4-Hyp⁷, A5c¹², Apc¹⁶) hGhrelin(1-28)-NH₂; (SEQ ID NO: 81) (Aib², Glu³(NH-Hexyl), Pip⁷, A5c¹², Apc¹⁶)hGhrelin (1-28)-NH₂; (SEQ ID NO: 81) (Aib², Glu³(NH-Hexyl), Dhp⁷, A5c¹², Apc¹⁶)hGhrelin (1-28)-NH₂; (SEQ ID NO: 81) (Aib², Glu³(NH-Hexyl), Ktp⁷, A5c¹², Apc¹⁶)hGhrelin (1-28)-NH₂; (SEQ ID NO: 82) (Aib^(2,8), Glu³(NH-Hexyl), A5c¹², Apc¹⁶)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 80) (Aib², Glu³(NH-Hexyl), 2-Pal⁹, A5c¹², Apc¹⁶) hGhrelin(1-28)-NH₂; (SEQ ID NO: 80) (Aib², Glu³(NH-Hexyl), 3-Pal⁹, A5c¹², Apc¹⁶) hGhrelin(1-28)-NH₂; (SEQ ID NO: 80) (Aib², Glu³(NH-Hexyl), 4-Pal⁹, A5c¹², Apc¹⁶) hGhrelin(1-28)-NH₂; (SEQ ID NO: 80) (Aib², Glu³(NH-Hexyl), Taz⁹, A5c¹², Apc¹⁶)hGhrelin (1-28)-NH₂; (SEQ ID NO: 80) (Aib², Glu³(NH-Hexyl), 2-Thi⁹, A5c¹², Apc¹⁶) hGhrelin(1-28)- NH₂; (SEQ ID NO: 80) (Aib², Glu³(NH-Hexyl), 2-Fua⁹, A5c¹², Apc¹⁶) hGhrelin(1-28)-NH₂; (SEQ ID NO: 80) (Aib², Glu³(NH-Hexyl), Apc⁹, A5c¹², Apc¹⁶)hGhrelin (1-28)-NH₂; (SEQ ID NO: 80) (Aib^(2,9), Glu³(NH-Hexyl), A5c¹², Apc¹⁶)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 83) (Aib^(2,10), Glu³(NH-Hexyl), A5c¹², Apc¹⁶)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 1) (Glu³(O-hexyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 10) (Aib²)hGhrelin(1-28)-NH₂; (SEQ ID NO: 1) (Glu³(NH-Hexyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 84) (Aib², Glu³(O-Hexyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 85) (Aib¹, Glu³(O-Hexyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 84) (Aib², Glu³(NH-Hexyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 1) (Dap³(1-Octanesulfonyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 84) (Aib², Dap³(1-Octanesulfonyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 85) (Aib¹, Dap³(1-Octanesulfonyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 86) (Ava², Dap³(1-Octanesulfonyl))hGhrelin(2-28)-NH₂; (SEQ ID NO: 87) (Ac-Gly¹)hGhrelin(1-5)-NH₂; (SEQ ID NO: 88) (Ac-Gly¹)hGhrelin(1-6)-NH₂; (SEQ ID NO: 89) (Ac-Gly¹)hGhrelin(1-7)-NH₂; (SEQ ID NO: 90) (Ac-Gly¹, Aib2)hGhrelin(1-28)-NH₂; (SEQ ID NO: 91) (Ac-Gly¹, Aib², Glu³(NH-Hexyl))hGhrelin(1-5)-NH₂; (SEQ ID NO: 92) (Ac-Gly¹, Aib², Glu³(NH-Hexyl))hGhrelin(1-6)-NH₂; (SEQ ID NO: 93) (Ac-Gly¹, Aib², Glu³(NH-Hexyl))hGhrelin(1-7)-NH₂; (SEQ ID NO: 335) (Ac-Gly¹, Aib², Glu³(NH-Hexyl))hGhrelin(1-28)-NH₂; (SEQ ID NO: 94) (Ac-Gly¹, Aib², Glu³(NH-Hexyl), Arg⁸)hGhrelin(1- 8)-NH₂; (SEQ ID NO: 94) (Ac-Gly¹, Aib², Glu³(NH-Hexyl), Lys8)hGhrelin(1- 8)-NH₂; (SEQ ID NO: 95) (n-Butyryl-Gly¹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 335) (n-Butyryl-Gly¹, Aib², Glu³(NH-Hexyl))hGhrelin(1- 28)-NH₂; (SEQ ID NO: 95) (Isobutyryl-Gly¹)hGhrelin(1-28)-NH₂; or  (SEQ ID NO: 95) (n-Octanoyl-Gly¹)hGhrelin(1-28)-NH₂,  or a pharmaceutically acceptable salt thereof.

(SEQ ID NO: 1) Cys³(S(CH₂)₉CH₃)hGhrelin(1-28)-NH₂; (SEQ ID NO: 10) (Aib², Ser³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 4) (Aib^(2,6), Ser³)hGhrelin(1-28)-NH₂ (SEQ ID NO: 8) (Aib², Ser³, 3-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 9) (Aib², Ser³, Thz⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 2) (Aib², Ser³, Cha⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 4) (Aib², Ser³, Abu⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 9) (Aib², Ser³, 4-Hyp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 8) (Aib², Ser³, Taz⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 9) (Aib², Ser³, Dhp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 11) (Aib^(2,8), Ser³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 9) (Aib², Ser³, Pip⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 96) (Ac-Gly¹, Aib^(2,10), Ser³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 12) (Aib^(2,10), Ser³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 97) (n-Butyryl-Gly¹, Aib², Ser³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 97) (Ac-Gly¹, Aib², Ser³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 9) (Aib², Ser³, Tic⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 98) (Ac-Gly¹, Aib², Ser³, Arg⁸)hGhrelin(1-28)-NH₂; (SEQ ID NO: 16) (Ser³, Aib⁸)hGhrelin(1-28)-NH₂; (SEQ ID NO: 14) (Ser³, Taz⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 14) (Ser³, 3-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 14) (Ser³, 4-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 8) (Aib², Ser³, 2-Thi⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 14) (Ser³, 2-Thi⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 15) (Ser³, 4-Hyp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 9) (Aib², Ser³, Tic⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 99) (Aib², Thr³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 99) (Aib^(2,6), Thr³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 100) (A5c⁵, Thr³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 101) (Aib², Thr³, 3-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 102) (Aib², Thr³, Thz⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 103) (Aib², Thr³, Cha⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 99) (Aib², Thr³, Abu⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 102) (Aib², Thr³, 4-Hyp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 101) (Aib², Thr³, Taz⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 102) (Aib², Thr³, Dhp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 11) (Aib^(2,8), Thr³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 102) (Aib², Thr³, Pip⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 104) (Ac-Gly¹, Aib^(2,10), Thr³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 106) (Aib^(2,10), Thr³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 105) (n-Butyryl-Gly¹, Aib², Thr³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 105) (Ac-Gly¹, Aib², Thr³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 102) (Aib², Thr³, Tic⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 90) (Ac-Gly¹, Aib², Thr³, Arg⁸)hGhrelin(1-28)-NH₂; (SEQ ID NO: 107) (Thr³, Aib⁸)hGhrelin(1-28)-NH₂; (SEQ ID NO: 108) (Thr³, Taz⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 108) (Thr³, 3-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 108) (Thr³, 4-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 101) (Aib², Thr³, 2-Thi⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 108) (Thr³, 2-Thi⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 109) (Thr³, 4-Hyp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 102) (Aib², Thr³, Tic⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 110) (Ac-Gly¹, Glu³(NH-Hexyl))hGhrelin(1-28)-NH₂; or (SEQ ID NO: 112) H-Inp-D-1-Nal-D-Trp-3-Pal-Lys-NH₂; (SEQ ID NO: 113) H-Inp-D-2-Nal-D-Trp-4-Pal-Lys-NH₂; (SEQ ID NO: 113) H-Inp-D-2-Nal-D-Trp-Orn-Lys-NH₂; (SEQ ID NO: 111) H-Inp-D-Bip-D-Trp-Phe-Lys-NH₂; (SEQ ID NO: 113) H-Inp-D-2-Nal-D-Trp-Thr(Bzl)-Lys-NH₂; (SEQ ID NO: 113) H-Inp-D-2-Nal-D-Trp-Pff-Lys-NH₂; (SEQ ID NO: 113) H-Inp-D-2-Nal-D-Trp-2-Thi-Lys-NH₂; (SEQ ID NO: 113) H-Inp-D-2-Nal-D-Trp-Taz-Lys-NH₂; (SEQ ID NO: 111) H-Inp-D-Dip-D-Trp-Phe-Lys-NH₂; (SEQ ID NO: 111) H-Inp-D-Bpa-D-Trp-Phe-Lys-NH₂; (SEQ ID NO: 114) H-Inp-D-2-Nal-D-Bpa-Phe-Lys-NH₂; (SEQ ID NO: 115) H-Inp-D-2-Nal-D-Trp-3-Pal-NH₂; (SEQ ID NO: 115) H-Inp-D-2-Nal-D-Trp-4-Pal-NH₂; (SEQ ID NO: 116) H-Inp-D-1-Nal-D-Trp-3-Pal-NH₂; (SEQ ID NO: 117) H-Inp-D-Bip-D-Trp-Phe-NH₂; (SEQ ID NO: 115) H-Inp-D-2-Nal-D-Trp-Thr(Bzl)-NH₂; (SEQ ID NO: 115) H-Inp-D-2-Nal-D-Trp-Pff-NH₂; (SEQ ID NO: 115) H-Inp-D-2-Nal-D-Trp-2-Thi-NH₂; (SEQ ID NO: 115) H-Inp-D-2-Nal-D-Trp-Taz-NH₂; (SEQ ID NO: 117) H-Inp-D-Dip-D-Trp-Phe-NH₂; (SEQ ID NO: 118) H-Inp-D-2-Nal-D-Dip-Phe-NH₂; (SEQ ID NO: 119) H-Inp-D-Bal-D-Trp-Phe-NH₂; (SEQ ID NO: 118) H-Inp-D-2-Nal-D-Bal-Phe-NH₂; (SEQ ID NO: 113) H-Inp-D-2-Nal-D-Trp-3-Pal-Lys-NH₂; (SEQ ID NO: 120) H-Inp-D-Trp-D-2-Nal(Ψ)-Pim; (SEQ ID NO: 121) H-Inp-D-Bal-D-Trp-2-Thi-Lys-NH₂; (SEQ ID NO: 111) H-Inp-D-Bal-D-Trp-Phe-Lys-NH₂; (SEQ ID NO: 112) H-Inp-D-1-Nal-D-Trp-2-Thi-Lys-NH₂; (SEQ ID NO: 122) H-Inp-D-2-Nal-D-Trp-Phe-Apc-NH₂; (SEQ ID NO: 122) H-Inp-D-1-Nal-D-Trp-Phe-Apc-NH₂; (SEQ ID NO: 122) H-Inp-D-Bal-D-Trp-Phe-Apc-NH₂; (SEQ ID NO: 123) H-Apc-D-2-Nal-D-Trp-Phe-Lys-NH₂; (SEQ ID NO: 124) H-Apc-D-1-Nal-D-Trp-2-Thi-Lys-NH₂; (SEQ ID NO: 116) H-Inp-D-1-Nal-D-Trp-2-Thi-NH₂; (SEQ ID NO: 125) H-Apc-D-1-Nal-D-Trp-Phe-NH₂; (SEQ ID NO: 126) H-Inp-D-2-Nal-D-Trp(Ψ)-Pim; (SEQ ID NO: 126) H-Inp-D-1-Nal-D-Trp(Ψ)-Pim; (SEQ ID NO: 126) H-Inp-D-Bal-D-Trp(Ψ)-Pim; (SEQ ID NO: 127) H-Aib-D-Ser(Bzl)-D-Trp(Ψ)-Pim; (SEQ ID NO: 112) H-Inp-D-1-Nal-D-Trp-Taz-Lys-NH₂; (SEQ ID NO: 121) H-Inp-D-Bal-D-Trp-Taz-Lys-NH₂; (SEQ ID NO: 124) H-Apc-D-1-Nal-D-Trp-Taz-Lys-NH₂; (SEQ ID NO: 128) H-Apc-D-Bal-D-Trp-Taz-Lys-NH₂; (SEQ ID NO: 128) H-Apc-D-Bal-D-Trp-2-Thi-Lys-NH₂; (SEQ ID NO: 123) H-Apc-D-Bal-D-Trp-Phe-Lys-NH₂; (SEQ ID NO: 129) H-Apc-D-1-Nal-D-Trp-Phe-Apc-NH₂; (SEQ ID NO: 130) H-Apc-D-Bal-D-Trp-Phe-Apc-NH₂; (SEQ ID NO: 129) H-Apc-D-1-Nal-D-1-Nal-Phe-Apc-NH₂; (SEQ ID NO: 129) H-Apc-D-1-Nal-D-2-Nal-Phe-Apc-NH₂; (SEQ ID NO: 131) H-Apc-D-1-Nal-D-1-Nal-Phe-Lys-NH₂; (SEQ ID NO: 130) H-Apc-D-Bal-D-1-Nal-Phe-Apc-NH₂; (SEQ ID NO: 130) H-Apc-D-Bal-D-2-Nal-Phe-Apc-NH₂; (SEQ ID NO: 132) H-Apc-D-Bal-D-1-Nal-Phe-Lys-NH₂; (SEQ ID NO: 132) H-Apc-D-Bal-D-2-Nal-Phe-Lys-NH₂; (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-2-Thi-NH₂; (SEQ ID NO: 125) H-Apc-D-Bal-D-Trp-Phe-NH₂; (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-Taz-NH₂; (SEQ ID NO: 144) H-Apc-D-Bal-D-Trp-2-Thi-NH₂; (SEQ ID NO: 144) H-Apc-D-Bal-D-Trp-Taz-NH₂; (SEQ ID NO: 134) H-Apc-D-2-Nal-D-Trp-2-Thi-NH₂; (SEQ ID NO: 134) H-Apc-D-2-Nal-D-Trp-Taz-NH₂; (SEQ ID NO: 135) H-Inp-D-1-Nal-D-Trp-Taz-Apc-NH₂; (SEQ ID NO: 135) H-Inp-D-Bal-D-Trp-Taz-Apc-NH₂; (SEQ ID NO: 136) H-Apc-D-1-Nal-D-Trp-Taz-Apc-NH₂; (SEQ ID NO: 136) H-Apc-D-Bal-D-Trp-Taz-Apc-NH₂; (SEQ ID NO: 137) H-Apc-D-1-Nal-D-Trp-2-Fua-Apc-NH₂; (SEQ ID NO: 124) H-Apc-D-1-Nal-D-Trp-2-Fua-Lys-NH₂; (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-2-Fua-NH₂; (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-2-Pal-NH₂; (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-3-Pal-NH₂; (SEQ ID NO: 137) H-Apc-D-1-Nal-D-Trp-3-Thi-Apc-NH₂; (SEQ ID NO: 124) H-Apc-D-1-Nal-D-Trp-3-Thi-Lys-NH₂; (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-3-Thi-NH₂; (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-4-Pal-NH₂; (SEQ ID NO: 137) H-Apc-D-1-Nal-D-Trp-Pff-Apc-NH₂; (SEQ ID NO: 124) H-Apc-D-1-Nal-D-Trp-Pff-Lys-NH₂; (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-Pff-NH₂; (SEQ ID NO: 138) H-Apc-D-2-Nal-D-Trp-2-Fua-Apc-NH₂; (SEQ ID NO: 139) H-Apc-D-2-Nal-D-Trp-2-Fua-Lys-NH₂; (SEQ ID NO: 134) H-Apc-D-2-Nal-D-Trp-2-Fua-NH₂; (SEQ ID NO: 134) H-Apc-D-2-Nal-D-Trp-2-Pal-NH₂; (SEQ ID NO: 138) H-Apc-D-2-Nal-D-Trp-2-Thi-Apc-NH₂; (SEQ ID NO: 139) H-Apc-D-2-Nal-D-Trp-2-Thi-Lys-NH₂; (SEQ ID NO: 134) H-Apc-D-2-Nal-D-Trp-3-Pal-NH₂; (SEQ ID NO: 138) H-Apc-D-2-Nal-D-Trp-3-Thi-Apc-NH₂; (SEQ ID NO: 139) H-Apc-D-2-Nal-D-Trp-3-Thi-Lys-NH₂; (SEQ ID NO: 134) H-Apc-D-2-Nal-D-Trp-3-Thi-NH₂; (SEQ ID NO: 134) H-Apc-D-2-Nal-D-Trp-4-Pal-NH₂; (SEQ ID NO: 138) H-Apc-D-2-Nal-D-Trp-Pff-Apc-NH₂; (SEQ ID NO: 139) H-Apc-D-2-Nal-D-Trp-Pff-Lys-NH₂; (SEQ ID NO: 134) H-Apc-D-2-Nal-D-Trp-Pff-NH₂; (SEQ ID NO: 136) H-Apc-D-2-Nal-D-Trp-Taz-Apc-NH₂; (SEQ ID NO: 139) H-Apc-D-2-Nal-D-Trp-Taz-Lys-NH₂; (SEQ ID NO: 140) H-Apc-D-Bal-D-Bal-2-Fua-Apc-NH₂; (SEQ ID NO: 141) H-Apc-D-Bal-D-Bal-2-Fua-Lys-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-2-Fua-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-2-Pal-NH₂; (SEQ ID NO: 140) H-Apc-D-Bal-D-Bal-2-Thi-Apc-NH₂; (SEQ ID NO: 141) H-Apc-D-Bal-D-Bal-2-Thi-Lys-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-2-Thi-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-3-Pal-NH₂; (SEQ ID NO: 140) H-Apc-D-Bal-D-Bal-3-Thi-Apc-NH₂; (SEQ ID NO: 141) H-Apc-D-Bal-D-Bal-3-Thi-Lys-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-3-Thi-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-4-Pal-NH₂; (SEQ ID NO: 140) H-Apc-D-Bal-D-Bal-Pff-Apc-NH₂; (SEQ ID NO: 141) H-Apc-D-Bal-D-Bal-Pff-Lys-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-Pff-NH₂; (SEQ ID NO: 130) H-Apc-D-Bal-D-Bal-Phe-Apc-NH₂; (SEQ ID NO: 132) H-Apc-D-Bal-D-Bal-Phe-Lys-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-Phe-NH₂; (SEQ ID NO: 140) H-Apc-D-Bal-D-Bal-Taz-Apc-NH₂; (SEQ ID NO: 141) H-Apc-D-Bal-D-Bal-Taz-Lys-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-Taz-NH₂; (SEQ ID NO: 143) H-Apc-D-Bal-D-Trp-2-Fua-Apc-NH₂; (SEQ ID NO: 128) H-Apc-D-Bal-D-Trp-2-Fua-Lys-NH₂; (SEQ ID NO: 144) H-Apc-D-Bal-D-Trp-2-Fua-NH₂; (SEQ ID NO: 144) H-Apc-D-Bal-D-Trp-2-Pal-NH₂; (SEQ ID NO: 144) H-Apc-D-Bal-D-Trp-3-Pal-NH₂; (SEQ ID NO: 143) H-Apc-D-Bal-D-Trp-3-Thi-Apc-NH₂; (SEQ ID NO: 128) H-Apc-D-Bal-D-Trp-3-Thi-Lys-NH₂; (SEQ ID NO: 144) H-Apc-D-Bal-D-Trp-3-Thi-NH₂; (SEQ ID NO: 144) H-Apc-D-Bal-D-Trp-4-Pal-NH₂; (SEQ ID NO: 143) H-Apc-D-Bal-D-Trp-Pff-Apc-NH₂; (SEQ ID NO: 128) H-Apc-D-Bal-D-Trp-Pff-Lys-NH₂; (SEQ ID NO: 144) H-Apc-D-Bal-D-Trp-Pff-NH₂; (SEQ ID NO: 145) H-Inp-D-1-Nal-D-Bal-2-Fua-Lys-NH₂;  (SEQ ID NO: 146) H-Inp-D-1-Nal-D-Bal-2-Fua-NH₂; (SEQ ID NO: 145) H-Inp-D-1-Nal-D-Bal-2-Thi-Lys-NH₂; (SEQ ID NO: 145) H-Inp-D-1-Nal-D-Bal-3-Thi-Lys-NH₂; (SEQ ID NO: 145) H-Inp-D-1-Nal-D-Bal-Pff-Lys-NH₂; (SEQ ID NO: 146) H-Inp-D-1-Nal-D-Bal-Pff-NH₂; (SEQ ID NO: 145) H-Inp-D-1-Nal-D-Bal-Phe-Lys-NH₂; (SEQ ID NO: 145) H-Inp-D-1-Nal-D-Bal-Taz-Lys-NH₂; (SEQ ID NO: 146) H-Inp-D-1-Nal-D-Bal-Taz-NH₂; (SEQ ID NO: 147) H-Inp-D-1-Nal-D-Trp-2-Fua-Apc-NH₂; (SEQ ID NO: 112) H-Inp-D-1-Nal-D-Trp-2-Fua-Lys-NH₂; (SEQ ID NO: 116) H-Inp-D-1-Nal-D-Trp-2-Fua-NH₂; (SEQ ID NO: 147) H-Inp-D-1-Nal-D-Trp-3-Thi-Apc-NH₂; (SEQ ID NO: 112) H-Inp-D-1-Nal-D-Trp-3-Thi-Lys-NH₂; (SEQ ID NO: 147) H-Inp-D-1-Nal-D-Trp-Pff-Apc-NH₂; (SEQ ID NO: 112) H-Inp-D-1-Nal-D-Trp-Pff-Lys-NH₂; (SEQ ID NO: 116) H-Inp-D-1-Nal-D-Trp-Pff-NH₂; (SEQ ID NO: 116) H-Inp-D-1-Nal-D-Trp-Taz-NH₂; (SEQ ID NO: 148) H-Inp-D-2-Nal-D-Trp-2-Fua-Apc-NH₂; (SEQ ID NO: 115) H-Inp-D-2-Nal-D-Trp-2-Fua-NH₂; (SEQ ID NO: 148) H-Inp-D-2-Nal-D-Trp-2-Thi-Apc-NH₂; (SEQ ID NO: 148) H-Inp-D-2-Nal-D-Trp-3-Thi-Apc-NH₂; (SEQ ID NO: 113) H-Inp-D-2-Nal-D-Trp-3-Thi-Lys-NH₂; (SEQ ID NO: 115) H-Inp-D-2-Nal-D-Trp-3-Thi-NH₂; (SEQ ID NO: 148) H-Inp-D-2-Nal-D-Trp-Pff-Apc-NH₂; (SEQ ID NO: 115) H-Inp-D-2-Nal-D-Trp-Pff-NH₂; (SEQ ID NO: 135) H-Inp-D-2-Nal-D-Trp-Taz-Apc-NH₂; (SEQ ID NO: 115) H-Inp-D-2-Nal-D-Trp-Taz-NH₂; (SEQ ID NO: 149) H-Inp-D-Bal-D-Bal-2-Fua-Lys-NH₂; (SEQ ID NO: 150) H-Inp-D-Bal-D-Bal-2-Fua-NH₂; (SEQ ID NO: 149) H-Inp-D-Bal-D-Bal-2-Thi-Lys-NH₂; (SEQ ID NO: 149) H-Inp-D-Bal-D-Bal-3-Thi-Lys-NH₂; (SEQ ID NO: 149) H-Inp-D-Bal-D-Bal-Pff-Lys-NH₂; (SEQ ID NO: 150) H-Inp-D-Bal-D-Bal-Pff-NH₂; (SEQ ID NO: 149) H-Inp-D-Bal-D-Bal-Phe-Lys-NH₂; (SEQ ID NO: 149) H-Inp-D-Bal-D-Bal-Taz-Lys-NH₂; (SEQ ID NO: 150) H-Inp-D-Bal-D-Bal-Taz-NH₂; (SEQ ID NO: 151) H-Inp-D-Bal-D-Trp-2-Fua-Apc-NH₂; (SEQ ID NO: 121) H-Inp-D-Bal-D-Trp-2-Fua-Lys-NH₂; (SEQ ID NO: 152) H-Inp-D-Bal-D-Trp-2-Fua-NH₂; (SEQ ID NO: 151) H-Inp-D-Bal-D-Trp-3-Thi-Apc-NH₂; (SEQ ID NO: 121) H-Inp-D-Bal-D-Trp-3-Thi-Lys-NH₂; (SEQ ID NO: 151) H-Inp-D-Bal-D-Trp-Pff-Apc-NH₂; (SEQ ID NO: 121) H-Inp-D-Bal-D-Trp-Pff-Lys-NH₂; (SEQ ID NO: 152) H-Inp-D-Bal-D-Trp-Pff-NH₂; (SEQ ID NO: 152) H-Inp-D-Bal-D-Trp-Taz-NH₂; (SEQ ID NO: 153) H-Inp-D-Bip-D-Bal-2-Fua-Lys-NH₂; (SEQ ID NO: 154) H-Inp-D-Bip-D-Bal-2-Fua-NH₂; (SEQ ID NO: 153) H-Inp-D-Bip-D-Bal-2-Thi-Lys-NH₂; (SEQ ID NO: 153) H-Inp-D-Bip-D-Bal-3-Thi-Lys-NH₂; (SEQ ID NO: 153) H-Inp-D-Bip-D-Bal-Pff-Lys-NH₂; (SEQ ID NO: 154) H-Inp-D-Bip-D-Bal-Pff-NH₂; or (SEQ ID NO: 153) H-Inp-D-Bip-D-Bal-Taz-Lys-NH₂; (SEQ ID NO: 154) H-Inp-D-Bip-D-Bal-Taz-NH₂; (SEQ ID NO: 155) H-Inp-D-Bip-D-Trp-2-Fua-Lys-NH₂; (SEQ ID NO: 156) H-Inp-D-Bip-D-Trp-2-Fua-NH₂; (SEQ ID NO: 155) H-Inp-D-Bip-D-Trp-2-Thi-Lys-NH₂; (SEQ ID NO: 155) H-Inp-D-Bip-D-Trp-3-Thi-Lys-NH₂; (SEQ ID NO: 155) H-Inp-D-Bip-D-Trp-Pff-Lys-NH₂; (SEQ ID NO: 156) H-Inp-D-Bip-D-Trp-Pff-NH₂; (SEQ ID NO: 155) H-Inp-D-Bip-D-Trp-Taz-Lys-NH₂; or (SEQ ID NO: 156) H-Inp-D-Bip-D-Trp-Taz-NH₂; (SEQ ID NO: 112) H-Inp-D-1-Nal-D-Trp-3-Pal-Lys-NH₂; (SEQ ID NO: 113) H-Inp-D-2-Nal-D-Trp-4-Pal-Lys-NH₂; (SEQ ID NO: 113) H-Inp-D-2-Nal-D-Trp-Orn-Lys-NH₂; (SEQ ID NO: 111) H-Inp-D-Bip-D-Trp-Phe-Lys-NH₂; (SEQ ID NO: 113) H-Inp-D-2-Nal-D-Trp-Thr(Bzl)-Lys-NH₂; (SEQ ID NO: 113) H-Inp-D-2-Nal-D-Trp-Pff-Lys-NH₂; (SEQ ID NO: 113) H-Inp-D-2-Nal-D-Trp-2-Thi-Lys-NH₂; (SEQ ID NO: 113) H-Inp-D-2-Nal-D-Trp-Taz-Lys-NH₂; (SEQ ID NO: 111) H-Inp-D-Dip-D-Trp-Phe-Lys-NH₂; (SEQ ID NO: 111) H-Inp-D-Bpa-D-Trp-Phe-Lys-NH₂; (SEQ ID NO: 114) H-Inp-D-2-Nal-D-Bpa-Phe-Lys-NH₂; (SEQ ID NO: 115) H-Inp-D-2-Nal-D-Trp-Thr(Bzl)-NH₂; (SEQ ID NO: 115) H-Inp-D-2-Nal-D-Trp-Pff-NH₂; (SEQ ID NO: 115) H-Inp-D-2-Nal-D-Trp-Taz-NH₂; (SEQ ID NO: 118) H-Inp-D-2-Nal-D-Dip-Phe-NH₂; (SEQ ID NO: 113) H-Inp-D-2-Nal-D-Trp-3-Pal-Lys-NH₂; (SEQ ID NO: 120) H-Inp-D-Trp-D-2-Nal(Ψ)-Pim; (SEQ ID NO: 121) H-Inp-D-Bal-D-Trp-2-Thi-Lys-NH₂; (SEQ ID NO: 111) H-Inp-D-Bal-D-Trp-Phe-Lys-NH₂; (SEQ ID NO: 112) H-Inp-D-1-Nal-D-Trp-2-Thi-Lys-NH₂; (SEQ ID NO: 122) H-Inp-D-2-Nal-D-Trp-Phe-Apc-NH₂; (SEQ ID NO: 122) H-Inp-D-1-Nal-D-Trp-Phe-Apc-NH₂; (SEQ ID NO: 122) H-Inp-D-Bal-D-Trp-Phe-Apc-NH₂; (SEQ ID NO: 123) H-Apc-D-2-Nal-D-Trp-Phe-Lys-NH₂; (SEQ ID NO: 124) H-Apc-D-1-Nal-D-Trp-2-Thi-Lys-NH₂; (SEQ ID NO: 126) H-Inp-D-2-Nal-D-Trp(Ψ)-Pim; (SEQ ID NO: 126) H-Inp-D-1-Nal-D-Trp(Ψ)-Pim; (SEQ ID NO: 126) H-Inp-D-Bal-D-Trp(Ψ)-Pim; (SEQ ID NO: 127) H-Aib-D-Ser(Bzl)-D-Trp(Ψ)-Pim; (SEQ ID NO: 112) H-Inp-D-1-Nal-D-Trp-Taz-Lys-NH₂; (SEQ ID NO: 121) H-Inp-D-Bal-D-Trp-Taz-Lys-NH₂; (SEQ ID NO: 124) H-Apc-D-1-Nal-D-Trp-Taz-Lys-NH₂; (SEQ ID NO: 128) H-Apc-D-Bal-D-Trp-Taz-Lys-NH₂; (SEQ ID NO: 128) H-Apc-D-Bal-D-Trp-2-Thi-Lys-NH₂; (SEQ ID NO: 123) H-Apc-D-Bal-D-Trp-Phe-Lys-NH₂; (SEQ ID NO: 129) H-Apc-D-1-Nal-D-Trp-Phe-Apc-NH₂; (SEQ ID NO: 130) H-Apc-D-Bal-D-Trp-Phe-Apc-NH₂; (SEQ ID NO: 129) H-Apc-D-1-Nal-D-1-Nal-Phe-Apc-NH₂; (SEQ ID NO: 129) H-Apc-D-1-Nal-D-2-Nal-Phe-Apc-NH₂; (SEQ ID NO: 131) H-Apc-D-1-Nal-D-1-Nal-Phe-Lys-NH₂; (SEQ ID NO: 130) H-Apc-D-Bal-D-1-Nal-Phe-Apc-NH₂; (SEQ ID NO: 130) H-Apc-D-Bal-D-2-Nal-Phe-Apc-NH₂; (SEQ ID NO: 132) H-Apc-D-Bal-D-1-Nal-Phe-Lys-NH₂; (SEQ ID NO: 132) H-Apc-D-Bal-D-2-Nal-Phe-Lys-NH₂; (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-2-Thi-NH₂; (SEQ ID NO: 157) H-Apc-D-Bal-D-Trp-Phe-NH₂; (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-Taz-NH₂; (SEQ ID NO: 157) H-Apc-D-Bal-D-Trp-2-Thi-NH₂; (SEQ ID NO: 157) H-Apc-D-Bal-D-Trp-Taz-NH₂; (SEQ ID NO: 134) H-Apc-D-2-Nal-D-Trp-2-Thi-NH₂; (SEQ ID NO: 134) H-Apc-D-2-Nal-D-Trp-Taz-NH₂; (SEQ ID NO: 135) H-Inp-D-1-Nal-D-Trp-Taz-Apc-NH₂; (SEQ ID NO: 135) H-Inp-D-Bal-D-Trp-Taz-Apc-NH₂; (SEQ ID NO: 136) H-Apc-D-1-Nal-D-Trp-Taz-Apc-NH₂; (SEQ ID NO: 136) H-Apc-D-Bal-D-Trp-Taz-Apc-NH₂; (SEQ ID NO: 113) H-Inp-D-2-Nal-D-Trp-3-Thi-Lys-NH₂; (SEQ ID NO: 121) H-Inp-D-Bal-D-Trp-3-Thi-Lys-NH₂; (SEQ ID NO: 121) H-Inp-D-Bal-D-Trp-2-Fua-Lys-NH₂; (SEQ ID NO: 121) H-Inp-D-Bal-D-Trp-Pff-Lys-NH₂; (SEQ ID NO: 151) H-Inp-D-Bal-D-Trp-3-Thi-Apc-NH₂; (SEQ ID NO: 151) H-Inp-D-Bal-D-Trp-2-Fua-Apc-NH₂; (SEQ ID NO: 151) H-Inp-D-Bal-D-Trp-Pff-Apc-NH₂; (SEQ ID NO: 128) H-Apc-D-Bal-D-Trp-3-Thi-Lys-NH₂; (SEQ ID NO: 128) H-Apc-D-Bal-D-Trp-2-Fua-Lys-NH₂; (SEQ ID NO: 128) H-Apc-D-Bal-D-Trp-Pff-Lys-NH₂; (SEQ ID NO: 149) H-Inp-D-Bal-D-Bal-Phe-Lys-NH₂; (SEQ ID NO: 149) H-Inp-D-Bal-D-Bal-2-Thi-Lys-NH₂; (SEQ ID NO: 149) H-Inp-D-Bal-D-Bal-3-Thi-Lys-NH₂; (SEQ ID NO: 149) H-Inp-D-Bal-D-Bal-Taz-Lys-NH₂; (SEQ ID NO: 149) H-Inp-D-Bal-D-Bal-2-Fua-Lys-NH₂; (SEQ ID NO: 149) H-Inp-D-Bal-D-Bal-Pff-Lys-NH₂; (SEQ ID NO: 132) H-Apc-D-Bal-D-Bal-Phe-Lys-NH₂; (SEQ ID NO: 141) H-Apc-D-Bal-D-Bal-2-Thi-Lys-NH₂; (SEQ ID NO: 141) H-Apc-D-Bal-D-Bal-3-Thi-Lys-NH₂; (SEQ ID NO: 141) H-Apc-D-Bal-D-Bal-Taz-Lys-NH₂; (SEQ ID NO: 141) H-Apc-D-Bal-D-Bal-2-Fua-Lys-NH₂; (SEQ ID NO: 141) H-Apc-D-Bal-D-Bal-Pff-Lys-NH₂; (SEQ ID NO: 112) H-Inp-D-1-Nal-D-Trp-3-Thi-Lys-NH₂; (SEQ ID NO: 112) H-Inp-D-1-Nal-D-Trp-2-Fua-Lys-NH₂; (SEQ ID NO: 112) H-Inp-D-1-Nal-D-Trp-Pff-Lys-NH₂; (SEQ ID NO: 158) H-Inp-D-1-Nal-D-Bal-Phe-Lys-NH₂; (SEQ ID NO: 158) H-Inp-D-1-Nal-D-Bal-2-Thi-Lys-NH₂; (SEQ ID NO: 158) H-Inp-D-1-Nal-D-Bal-3-Thi-Lys-NH₂; (SEQ ID NO: 158) H-Inp-D-1-Nal-D-Bal-Taz-Lys-NH₂; (SEQ ID NO: 158) H-Inp-D-1-Nal-D-Bal-2-Fua-Lys-NH₂; (SEQ ID NO: 158) H-Inp-D-1-Nal-D-Bal-Pff-Lys-NH₂; (SEQ ID NO: 159) H-Inp-D-2-Nal-D-Trp-2-Thi-Apc-NH₂; (SEQ ID NO: 159) H-Inp-D-2-Nal-D-Trp-3-Thi-Apc-NH₂; (SEQ ID NO: 135) H-Inp-D-2-Nal-D-Trp-Taz-Apc-NH₂; (SEQ ID NO: 159) H-Inp-D-2-Nal-D-Trp-2-Fua-Apc-NH₂; (SEQ ID NO: 159) H-Inp-D-2-Nal-D-Trp-Pff-Apc-NH₂; (SEQ ID NO: 160) H-Inp-D-1-Nal-D-Trp-3-Thi-Apc-NH₂; (SEQ ID NO: 160) H-Inp-D-1-Nal-D-Trp-2-Fua-Apc-NH₂; (SEQ ID NO: 160) H-Inp-D-1-Nal-D-Trp-Pff-Apc-NH₂; (SEQ ID NO: 124) H-Apc-D-1-Nal-D-Trp-3-Thi-Lys-NH₂; (SEQ ID NO: 124) H-Apc-D-1-Nal-D-Trp-2-Fua-Lys-NH₂; (SEQ ID NO: 124) H-Apc-D-1-Nal-D-Trp-Pff-Lys-NH₂; (SEQ ID NO: 139) H-Apc-D-2-Nal-D-Trp-2-Thi-Lys-NH₂; (SEQ ID NO: 139) H-Apc-D-2-Nal-D-Trp-3-Thi-Lys-NH₂; (SEQ ID NO: 139) H-Apc-D-2-Nal-D-Trp-Taz-Lys-NH₂; (SEQ ID NO: 139) H-Apc-D-2-Nal-D-Trp-2-Fua-Lys-NH₂; (SEQ ID NO: 139) H-Apc-D-2-Nal-D-Trp-Pff-Lys-NH₂; (SEQ ID NO: 155) H-Inp-D-Bip-D-Trp-2-Thi-Lys-NH₂; (SEQ ID NO: 155) H-Inp-D-Bip-D-Trp-3-Thi-Lys-NH₂; (SEQ ID NO: 155) H-Inp-D-Bip-D-Trp-Taz-Lys-NH₂; (SEQ ID NO: 155) H-Inp-D-Bip-D-Trp-2-Fua-Lys-NH₂; (SEQ ID NO: 155) H-Inp-D-Bip-D-Trp-Pff-Lys-NH₂; (SEQ ID NO: 153) H-Inp-D-Bip-D-Bal-2-Thi-Lys-NH₂; (SEQ ID NO: 153) H-Inp-D-Bip-D-Bal-3-Thi-Lys-NH₂; (SEQ ID NO: 153) H-Inp-D-Bip-D-Bal-Taz-Lys-NH₂; (SEQ ID NO: 153) H-Inp-D-Bip-D-Bal-2-Fua-Lys-NH₂; (SEQ ID NO: 153) H-Inp-D-Bip-D-Bal-Pff-Lys-NH₂; (SEQ ID NO: 143) H-Apc-D-Bal-D-Trp-3-Thi-Apc-NH₂; (SEQ ID NO: 143) H-Apc-D-Bal-D-Trp-2-Fua-Apc-NH₂; (SEQ ID NO: 143) H-Apc-D-Bal-D-Trp-Pff-Apc-NH₂; (SEQ ID NO: 130) H-Apc-D-Bal-D-Bal-Phe-Apc-NH₂; (SEQ ID NO: 140) H-Apc-D-Bal-D-Bal-2-Thi-Apc-NH₂; (SEQ ID NO: 140) H-Apc-D-Bal-D-Bal-3-Thi-Apc-NH₂; (SEQ ID NO: 140) H-Apc-D-Bal-D-Bal-Taz-Apc-NH₂; (SEQ ID NO: 140) H-Apc-D-Bal-D-Bal-2-Fua-Apc-NH₂; (SEQ ID NO: 140) H-Apc-D-Bal-D-Bal-Pff-Apc-NH₂; (SEQ ID NO: 137) H-Apc-D-1-Nal-D-Trp-3-Thi-Apc-NH₂; (SEQ ID NO: 137) H-Apc-D-1-Nal-D-Trp-2-Fua-Apc-NH₂; (SEQ ID NO: 137) H-Apc-D-1-Nal-D-Trp-Pff-Apc-NH₂; (SEQ ID NO: 138) H-Apc-D-2-Nal-D-Trp-2-Thi-Apc-NH₂; (SEQ ID NO: 138) H-Apc-D-2-Nal-D-Trp-3-Thi-Apc-NH₂; (SEQ ID NO: 136) H-Apc-D-2-Nal-D-Trp-Taz-Apc-NH₂; (SEQ ID NO: 138) H-Apc-D-2-Nal-D-Trp-2-Fua-Apc-NH₂; (SEQ ID NO: 138) H-Apc-D-2-Nal-D-Trp-Pff-Apc-NH₂; (SEQ ID NO: 152) H-Inp-D-Bal-D-Trp-Taz-NH₂; (SEQ ID NO: 152) H-Inp-D-Bal-D-Trp-2-Fua-NH₂; (SEQ ID NO: 152) H-Inp-D-Bal-D-Trp-Pff-NH₂; (SEQ ID NO: 157) H-Apc-D-Bal-D-Trp-3-Thi-NH₂; (SEQ ID NO: 157) H-Apc-D-Bal-D-Trp-2-Fua-NH₂; (SEQ ID NO: 157) H-Apc-D-Bal-D-Trp-Pff-NH₂; (SEQ ID NO: 157) H-Apc-D-Bal-D-Trp-4-Pal-NH₂; (SEQ ID NO: 157) H-Apc-D-Bal-D-Trp-3-Pal-NH₂; (SEQ ID NO: 157) H-Apc-D-Bal-D-Trp-2-Pal-NH₂; (SEQ ID NO: 150) H-Inp-D-Bal-D-Bal-Taz-NH₂; (SEQ ID NO: 150) H-Inp-D-Bal-D-Bal-2-Fua-NH₂; (SEQ ID NO: 150) H-Inp-D-Bal-D-Bal-Pff-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-Phe-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-2-Thi-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-3-Thi-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-Taz-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-2-Fua-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-Pff-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-4-Pal-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-3-Pal-NH₂; (SEQ ID NO: 142) H-Apc-D-Bal-D-Bal-2-Pal-NH₂; (SEQ ID NO: 116) H-Inp-D-1-Nal-D-Trp-Taz-NH₂; (SEQ ID NO: 116) H-Inp-D-1-Nal-D-Trp-2-Fua-NH₂;  (SEQ ID NO: 116) H-Inp-D-1-Nal-D-Trp-Pff-NH₂; (SEQ ID NO: 161) H-Inp-D-1-Nal-D-Bal-Taz-NH₂; (SEQ ID NO: 161) H-Inp-D-1-Nal-D-Bal-2-Fua-NH₂;  (SEQ ID NO: 161) H-Inp-D-1-Nal-D-Bal-Pff-NH₂; (SEQ ID NO: 115) H-Inp-D-2-Nal-D-Trp-Taz-NH₂; (SEQ ID NO: 115) H-Inp-D-2-Nal-D-Trp-2-Fua-NH₂;  (SEQ ID NO: 115) H-Inp-D-2-Nal-D-Trp-Pff-NH₂; (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-3-Thi-NH₂;  (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-2-Fua-NH₂;  (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-Pff-NH₂; (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-4-Pal-NH₂;  (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-3-Pal-NH₂;  (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-2-Pal-NH₂;  (SEQ ID NO: 134) H-Apc-D-2-Nal-D-Trp-3-Thi-NH₂;  (SEQ ID NO: 134) H-Apc-D-2-Nal-D-Trp-2-Fua-NH₂;  (SEQ ID NO: 134) H-Apc-D-2-Nal-D-Trp-Pff-NH₂; (SEQ ID NO: 134) H-Apc-D-2-Nal-D-Trp-4-Pal-NH₂;  (SEQ ID NO: 134) H-Apc-D-2-Nal-D-Trp-3-Pal-NH₂;  (SEQ ID NO: 134) H-Apc-D-2-Nal-D-Trp-2-Pal-NH₂;  (SEQ ID NO: 156) H-Inp-D-Bip-D-Trp-Taz-NH₂; (SEQ ID NO: 156) H-Inp-D-Bip-D-Trp-2-Fua-NH₂; (SEQ ID NO: 156) H-Inp-D-Bip-D-Trp-Pff-NH₂; (SEQ ID NO: 154) H-Inp-D-Bip-D-Bal-Taz-NH₂; (SEQ ID NO: 154) H-Inp-D-Bip-D-Bal-2-Fua-NH₂; or (SEQ ID NO: 154) H-Inp-D-Bip-D-Bal-Pff-NH₂; (SEQ ID NO: 147) H-Inp-D-1-Nal-D-Trp-2-Thi-Apc-NH₂; (SEQ ID NO: 151) H-Inp-D-Bal-D-Trp-2-Thi-Apc-NH₂; (SEQ ID NO: 137) H-Apc-D-1-Nal-D-Trp-2-Thi-Apc-NH₂; (SEQ ID NO: 143) H-Apc-D-Bal-D-Trp-2-Thi-Apc-NH₂; or (SEQ ID NO: 131) H-Apc-D-1-Nal-D-Trp-Phe-Lys-NH₂; (SEQ ID NO: 162) (Ser(n-octanoyl)¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 163) (Glu(NH-hexyl)¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 164) (Glu(NH-hexyl)^(3,15))hGhrelin(1-28)-NH₂; (SEQ ID NO: 165) (Glu(NH-hexyl)³, Ser(n-octanoyl)¹⁵)hGhrelin(1-28)- NH₂; (SEQ ID NO: 166) (Aib², Glu(NH-hexyl)¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 167) (Aib², Glu(NH-hexyl)^(3,15))hGhrelin(1-28)-NH₂; (SEQ ID NO: 168) (Aib^(2,8), Glu(NH-hexyl)¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 169) (Aib^(2,8), Glu(NH-hexyl)^(3,15))hGhrelin(1-28)-NH₂;  (SEQ ID NO: 170) (Aib^(2,10), Glu(NH-hexyl)¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 171) (Aib^(2,10), Glu(NH-hexyl)^(3,15))hGhrelin(1-28)-NH₂; (SEQ ID NO: 172) (Ser(n-octanoyl)¹⁶hGhrelin(1-28)-NH₂; (SEQ ID NO: 173) (Glu(NH-hexyl)¹⁶hGhrelin(1-28)-NH₂; (SEQ ID NO: 174) (Glu(NH-hexyl)^(3,16))hGhrelin(1-28)-NH₂; (SEQ ID NO: 175) (Glu(NH-hexyl)³, Ser(n-octanoyl)¹⁶)hGhrelin(1-28)- NH₂; (SEQ ID NO: 176) (Aib², Glu(NH-hexyl)¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 177) (Aib², Glu(NH-hexyl)^(3,16))hGhrelin(1-28)-NH₂; (SEQ ID NO: 178) (Aib^(2,8), Glu(NH-hexyl)¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 179) (Aib^(2,8), Glu(NH-hexyl)^(3,16))hGhrelin(1-28)-NH₂; (SEQ ID NO: 180) (Aib^(2,10), Glu(NH-hexyl)¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 181) (Aib^(2,10), Glu(NH-hexyl)^(3,16))hGhrelin(1-28)-NH₂; (SEQ ID NO: 182) (Ser(n-octanoyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 183) (Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 184) (Glu(NH-hexyl^()3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 185) (Glu(NH-hexyl)³, Ser(n-octanoyl)¹⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 186) (Dap(octanesulfonyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 187) (Dap(octanesulfonyl)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 188) (Dap(octanesulfonyl)³, Glu(NH-hexyl)¹⁷)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 189) (Dap(octanesulfonyl)³, Ser(n-octanoyl)¹⁷)hGhrelin (1-28)-NH₂; (SEQ ID NO: 190) (Glu(NH-hexyl)³, Dap(octanesulfonyl)¹⁷)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 191) (Cys(S-(CH₂)₉CH₃)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 192) (Cys(S-(CH₂)₉CH₃)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 193) (Glu(NH-hexyl)³, Cys(S-(CH₂)₉CH₃3)¹⁷)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 194) (Cys(S-(CH₂)₉CH₃)³, Glu(NH-hexyl)¹⁷)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 195) (Cys(S-(CH₂)₉CH₃)³, Ser(n-octanoyl)¹⁷)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 196) (Aib², Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 197) (Aib², Glu(NH-hexyl)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 198) (Aib², Thz⁷, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 198) (Aib², 4-Hyp⁷, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 198) (Aib², Dhp⁷, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 198) (Aib², Pip⁷, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 198) (Aib², Tic⁷, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 199) (Aib², Glu(NH-hexyl)^(3,17), Thz⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 200) (Aib², Glu(NH-hexyl)^(3,17), 4-Hyp⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 200) (Aib², Glu(NH-hexyl)^(3,17), Dhp⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 200) (Aib², Glu(NH-hexyl)^(3,17), Pip⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 200) (Aib², Glu(NH-hexyl)^(3,17), Tic⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 201) (Aib^(2,8), Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 202) (Aib^(2,8), Glu(NH-hexyl)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 203) (Aib², 3-Pal⁹, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 203) (Aib², 4-Pal⁹, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 203) (Aib², Taz⁹, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 203) (Aib², 2-Thi⁹, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 204) (Aib², Glu(NH-hexyl)^(3,17), 3-Pal⁹)hGhrelin(1-28)- NH₂; (SEQ ID NO: 204) (Aib², Glu(NH-hexyl)^(3,17), 4-Pal⁹)hGhrelin(1-28)- NH₂; (SEQ ID NO: 204) (Aib², Glu(NH-hexyl)^(3,17), Taz⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 204) (Aib², Glu(NH-hexyl)^(3,17), 2-Thi⁹)hGhrelin(1-28)- NH₂; (SEQ ID NO: 205) (Aib^(2,10), Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 206) (Aib^(2,10), Glu(NH-hexyl)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 207) (Aib⁸, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 208) (Taz⁹, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 208) (3-Pal⁹, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 208) (4-Pal⁹, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 208) (2-Thi⁹, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 209) (Glu(NH-hexyl)^(3,17), Aib⁸)hGhrelin(1-28)-NH₂; (SEQ ID NO: 210) (Glu(NH-hexyl)^(3,17), Taz⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 210) (Glu(NH-hexyl)^(3,17), 3-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 210) (Glu(NH-hexyl)^(3,17), 4-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 210) (Glu(NH-hexyl)^(3,17), 2-Thi⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 211) (Aib¹,^(2,10), Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 212) (Aib¹,^(2,10), Glu(NH-hexyl)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 196) (A5c², Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 197) (A5c², Glu(NH-hexyl)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 184) (Glu(1-heptanol)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 213) (Asp(1-heptano1)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 184) (Glu(NH-hexyl)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 213) (Asp(NH-hexyl)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 197) (Aib², Glu(NH-hexyl)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 214) (Lys(biotinyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 215) (Ser(n-octanoyl)¹⁸)hGhrelin(1-28)-NH₂; (SEQ ID NO: 216) (Glu(NH-hexyl)¹⁸)hGhrelin(1-28)-NH₂; (SEQ ID NO: 217) (Glu(NH-hexyl)^(3,18))hGhrelin(1-28)-NH₂; (SEQ ID NO: 218) (Glu(NH-hexyl)³, Ser(n-octanoyl)¹⁸)hGhrelin(1-28)- NH₂; (SEQ ID NO: 219) (Aib², Glu(NH-hexyl)¹⁸)hGhrelin(1-28)-NH₂; (SEQ ID NO: 220) (Aib², Glu(NH-hexyl)^(3,18))hGhrelin(1-28)-NH₂; (SEQ ID NO: 221) (Aib^(2,8), Glu(NH-hexyl)¹⁸)hGhrelin(1-28)-NH₂; (SEQ ID NO: 222) (Aib^(2,8), Glu(NH-hexyl)^(3,18))hGhrelin(1-28)-NH₂; (SEQ ID NO: 223) (Aib^(2,10), Glu(NH-hexyl)¹⁸)hGhrelin(1-28)-NH₂; (SEQ ID NO: 224) (Aib^(2,10), Glu(NH-hexyl)^(3,18))hGhrelin(1-28)-NH₂; (SEQ ID NO: 225) (Ser(n-octanoyl)¹⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 226) (Glu(NH-hexyl)¹⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 227) (Glu(NH-hexyl)^(3,19))hGhrelin(1-28)-NH₂; (SEQ ID NO: 228) (Glu(NH-hexyl)³, Ser(n-octanoyl)¹⁹)hGhrelin(1-28)- NH₂; (SEQ ID NO: 229) (Aib², Glu(NH-hexyl)¹⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 230) (Aib², Glu(NH-hexyl)^(3,19))hGhrelin(1-28)-NH₂; (SEQ ID NO: 231) (Aib^(2,8), Glu(NH-hexyl)¹⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 232) (Aib^(2,8), Glu(NH-hexyl)^(3,19))hGhrelin(1-28)-NH₂; (SEQ ID NO: 233) (Aib^(2,10), Glu(NH-hexyl)¹⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 234) (Aib^(2,10), Glu(NH-hexyl)^(3,19))hGhrelin(1-28)-NH₂; (SEQ ID NO: 235) (Ser(n-octanoyl)²⁰)hGhrelin(1-28)-NH₂; (SEQ ID NO: 236) (Glu(NH-hexyl)²⁰)hGhrelin(1-28)-NH₂; (SEQ ID NO: 237) (Glu(NH-hexyl)^(3,20))hGhrelin(1-28)-NH₂; (SEQ ID NO: 238) (Glu(NH-hexyl)³, Ser(n-octanoyl)²⁰)hGhrelin(1-28)- NH₂; (SEQ ID NO: 239) (Aib², Glu(NH-hexyl)²⁰)hGhrelin(1-28)-NH₂; (SEQ ID NO: 240) (Aib², Glu(NH-hexyl)^(3,20))hGhrelin(1-28)-NH₂; (SEQ ID NO: 241) (Aib^(2,8), Glu(NH-hexyl)²⁰)hGhrelin(1-28)-NH₂; (SEQ ID NO: 242) (Aib^(2,8), Glu(NH-hexyl)^(3,20))hGhrelin(1-28)-NH₂; (SEQ ID NO: 243) (Aib^(2,10), Glu(NH-hexyl)²⁰)hGhrelin(1-28)-NH₂; (SEQ ID NO: 244) (Aib^(2,10), Glu(NH-hexyl)^(3,20))hGhrelin(1-28)-NH₂; (SEQ ID NO: 245) (Ac-Gly¹, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 246) (Ac-Gly¹, Ser(n-octanoyl)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 247) (Ac-Gly¹, Glu(NH-hexyl)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 248) (Ac-Gly¹, Glu(NH-hexyl)³, Ser(n-octanoyl)¹⁷) hGhrelin(1-28)-NH₂; (SEQ ID NO: 249) (Ac-Gly¹, Dap(octanesulfonyl)¹⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 250) (Ac-Gly¹, Dap(octanesulfonyl)^(3,17))hGhrelin(1-28)- NH₂; (SEQ ID NO: 251) (Ac-Gly¹, Dap(octanesulfonyl)³, Glu(NH-Hexyl)¹⁷) hGhrelin(1-28)-NH₂; (SEQ ID NO: 252) (Ac-Gly¹, Dap(octanesulfonyl)³, Ser(n-Octanoyl)¹⁷) hGhrelin(1-28)-NH₂; (SEQ ID NO: 253) (Ac-Gly¹, Glu(NH-hexyl)³, Dap(octanesulfonyl)¹⁷) hGhrelin(1-28)-NH₂; (SEQ ID NO: 254) (Ac-Gly¹, Cys(S-(CH₂)₉CH₃)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 255) (Ac-Gly¹, Cys(S-(CH₂)₉CH₃)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 256) (Ac-Gly¹, Glu(NH-hexyl)³, Cys(S-(CH₂)₉CH₃)¹⁷) hGhrelin(1-28)-NH₂; (SEQ ID NO: 257) (Ac-Gly¹, Cys(S-(CH₂)₉CH₃)³, Glu(NH-hexyl)¹⁷) hGhrelin(1-28)-NH₂; (SEQ ID NO: 258) (Ac-Gly¹, Cys(S-(CH₂)₉CH₃)³, Ser(n-octanoyl)¹⁷) hGhrelin(1-28)-NH₂; (SEQ ID NO: 259) (Ac-Gly¹, Aib², Glu(NH-hexyl)¹⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 260) (Ac-Gly¹, Aib², Thz⁷, Glu(NH-hexyl)¹⁷)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 260) (Ac-Gly¹, Aib², 4-Hyp⁷, Glu(NH-hexyl)¹⁷)hGhrelin (1-28)-NH₂; (SEQ ID NO: 260) (Ac-Gly¹, Aib², Dhp⁷, Glu(NH-hexyl)¹⁷)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 260) (Ac-Gly¹, Aib², Pip⁷, Glu(NH-hexyl)¹⁷)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 260) (Ac-Gly¹, Aib², Tic⁷, Glu(NH-hexyl)¹⁷)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 261) (Ac-Gly¹, Aib², Glu(NH-hexyl)^(3,17), Thz⁷)hGhrelin (1-28)-NH₂; (SEQ ID NO: 261) (Ac-Gly¹, Aib², Glu(NH-hexyl)^(3,17), 4-Hyp⁷)hGhrelin (1-28)-NH₂; (SEQ ID NO: 261) (Ac-Gly¹, Aib², Glu(NH-hexyl)^(3,17), Dhp⁷)hGhrelin (1-28)-NH₂; (SEQ ID NO: 261) (Ac-Gly¹, Aib², Glu(NH-hexyl)^(3,17), Pip⁷)hGhrelin (1-28)-NH₂; (SEQ ID NO: 261) (Ac-Gly¹, Aib², Glu(NH-hexyl)^(3,17), Tic⁷)hGhrelin (1-28)-NH₂; (SEQ ID NO: 262) (Ac-Gly¹, Aib^(2,8), Glu(NH-hexyl)¹⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 263) (Ac-Gly¹, Aib², 3-Pal⁹, Glu(NH-hexyl)¹⁷)hGhrelin (1-28)-NH₂; (SEQ ID NO: 263) (Ac-Gly¹, Aib², 4-Pal⁹, Glu(NH-hexyl)¹⁷)hGhrelin (1-28)-NH₂; (SEQ ID NO: 263) (Ac-Gly¹, Aib², Taz⁹, Glu(NH-hexyl)¹⁷)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 263) (Ac-Gly¹, Aib², 2-Thi⁹, Glu(NH-hexyl)¹⁷)hGhrelin (1-28)-NH₂; (SEQ ID NO: 264) (Ac-Gly¹, Aib², Glu(NH-hexyl)^(3,17), 3-Pal⁹)hGhrelin (1-28)-NH₂; (SEQ ID NO: 264) (Ac-Gly¹, Aib², Glu(NH-hexyl)^(3,17), 4-Pal⁹)hGhrelin (1-28)-NH₂; (SEQ ID NO: 264) (Ac-Gly¹, Aib², Glu(NH-hexyl)^(3,17), Taz⁹)hGhrelin (1-28)-NH₂; (SEQ ID NO: 264) (Ac-Gly¹, Aib², Glu(NH-hexyl)^(3,17), 2-Thi⁹)hGhrelin (1-28)-NH₂; (SEQ ID NO: 265) (Ac-Gly¹, Aib^(2,10), Glu(NH-hexyl)¹⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 266) (Ac-Gly¹, Aib^(2,10), Glu(NH-hexyl)^(3,17))hGhrelin(1- 28)-NH₂; (SEQ ID NO: 267) (Ac-Gly¹, Aib⁸, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 268) (Ac-Gly¹, Taz⁹, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 268) (Ac-Gly¹, 3-Pal⁹, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 268) (Ac-Gly¹, 4-Pal⁹, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 268) (Ac-Gly¹, 2-Thi⁹, Glu(NH-hexyl)¹⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 269) (Ac-Gly¹, Glu(NH-hexyl)^(3,17), Aib⁸)hGhrelin(1-28)- NH₂; (SEQ ID NO: 270) (Ac-Gly¹, Glu(NH-hexyl)^(3,17), Taz⁹)hGhrelin(1-28)- NH₂; (SEQ ID NO: 270) (Ac-Gly¹, Glu(NH-hexyl)^(3,17), 3-Pal⁹)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 270) (Ac-Gly¹, Glu(NH-hexyl)^(3,17), 4-Pal⁹)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 270) (Ac-Gly¹, Glu(NH-hexyl)^(3,17), 2-Thi⁹)hGhrelin(1- 28)-NH₂; (SEQ ID NO: 271) (Ac-Aib¹, Aib^(2,10), Glu(NH-hexyl)¹⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 272) (Ac-Aib¹, Aib^(2,10), Glu(NH-hexyl)^(3,17))hGhrelin(1- 28)-NH₂; (SEQ ID NO: 259) (Ac-Gly¹, A5c², Glu(NH-hexyl)¹⁷)hGhrelin(1-28)- NH₂; (SEQ ID NO: 273) (Ac-Gly¹, A5c², Glu(NH-hexyl)^(3,17))hGhrelin(1-28)- NH₂; (SEQ ID NO: 247) (Ac-Gly¹, Glu(1-heptano1)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 274) (Ac-Gly¹, Asp(1-heptano1)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 247) (Ac-Gly¹, Glu(NH-hexyl)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 274) (Ac-Gly¹, Asp(NH-hexyl)^(3,17))hGhrelin(1-28)-NH₂; (SEQ ID NO: 275) (Ac-Gly¹, Aib^(2,10), Glu(NH-hexyl)³, Lys (biotiny1)¹⁷)hGhrelin(1-28)-NH₂; (SEQ ID NO: 276) (Ac-Gly¹, Glu(NH-hexyl)¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 277) (Ac-Gly¹, Ser(n-octanoyl)¹⁵)hGhrelin(1-28)-NH₂; (SEQ ID NO: 278) (Ac-Gly¹, Glu(NH-hexyl)^(3,15))hGhrelin(1-28)-NH₂; (SEQ ID NO: 279) (Ac-Gly¹, Glu(NH-hexyl)³, Ser(n-octanoyl)¹⁵) hGhrelin(1-28)-NH₂; (SEQ ID NO: 280) (Ac-Gly¹, Aib², Glu(NH-hexyl)¹⁵)hGhrelin(1-28)- NH₂; (SEQ ID NO: 281) (Ac-Gly¹, Aib², Glu(NH-hexyl)^(3,15))hGhrelin(1-28)- NH₂; (SEQ ID NO: 282) (Ac-Gly¹, Aib^(2,8), Glu(NH-hexyl)¹⁵)hGhrelin(1-28)- NH₂; (SEQ ID NO: 283) (Ac-Gly¹, Aib^(2,8), Glu(NH-hexyl)^(3,15))hGhrelin(1- 28)-NH₂; (SEQ ID NO: 284) (Ac-Gly¹, Aib^(2,10), Glu(NH-hexyl)¹⁵)hGhrelin(1-28)- NH₂; (SEQ ID NO: 285) (Ac-Gly¹, Aib^(2,10), Glu(NH-hexyl)^(3,15))hGhrelin(1- 28)-NH₂; (SEQ ID NO: 286) (Ac-Gly¹, Glu(NH-hexyl)¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 287) (Ac-Gly¹, Ser(n-octanoyl)¹⁶)hGhrelin(1-28)-NH₂; (SEQ ID NO: 288) (Ac-Gly¹, Glu(NH-hexyl^()3,16))hGhrelin(1-28)-NH₂; (SEQ ID NO: 289) (Ac-Gly¹, Glu(NH-hexyl)³, Ser(n-octanoyl)¹⁶) hGhrelin(1-28)-NH₂; (SEQ ID NO: 290) (Ac-Gly¹, Aib², Glu(NH-hexyl)¹⁶)hGhrelin(1-28)- NH₂; (SEQ ID NO: 291) (Ac-Gly¹, Aib², Glu(NH-hexyl)^(3,16))hGhrelin(1-28)- NH₂; (SEQ ID NO: 292) (Ac-Gly¹, Aib^(2,8), Glu(NH-hexyl)¹⁶)hGhrelin(1-28)- NH₂; (SEQ ID NO: 293) (Ac-Gly¹, Aib^(2,8), Glu(NH-hexyl)^(3,16))hGhrelin(1- 28)-NH₂; (SEQ ID NO: 294) (Ac-Gly¹, Aib^(2,10), Glu(NH-hexyl)¹⁶)hGhrelin(1-28)- NH₂; (SEQ ID NO: 295) (Ac-Gly¹, Aib^(2,10), Glu(NH-hexyl)^(3,16))hGhrelin(1- 28)-NH₂; (SEQ ID NO: 296) (Ac-Gly¹, Glu(NH-hexyl)¹⁸)hGhrelin(1-28)-NH₂; (SEQ ID NO: 297) (Ac-Gly¹, Ser(n-octanoyl)¹⁸)hGhrelin(1-28)-NH₂; (SEQ ID NO: 298) (Ac-Gly¹, Glu(NH-hexyl)^(3,18))hGhrelin(1-28)-NH₂; (SEQ ID NO: 299) (Ac-Gly¹, Glu(NH-hexyl)³, Ser(n-octanoyl)¹⁸) hGhrelin(1-28)-NH₂; (SEQ ID NO: 300) (Ac-Gly¹, Aib², Glu(NH-hexyl)¹⁸)hGhrelin(1-28)- NH₂; (SEQ ID NO: 301) (Ac-Gly¹, Aib², Glu(NH-hexyl)^(3,18))hGhrelin(1-28)- NH₂; (SEQ ID NO: 302) (Ac-Gly¹, Aib^(2,8), Glu(NH-hexyl)¹⁸)hGhrelin(1-28)- NH₂; (SEQ ID NO: 303) (Ac-Gly¹, Aib^(2,8), Glu(NH-hexyl)^(3,18))hGhrelin(1- 28)-NH₂; (SEQ ID NO: 304) (Ac-Gly¹, Aib^(2,10), Glu(NH-hexyl)¹⁸)hGhrelin(1-28)- NH₂; (SEQ ID NO: 305) (Ac-Gly¹, Aib^(2,10), Glu(NH-hexyl)^(3,18))hGhrelin(1- 28)-NH₂; (SEQ ID NO: 306) (Ac-Gly¹, Glu(NH-hexyl)¹⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 307) (Ac-Gly¹, Ser(n-octanoyl)¹⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 308) (Ac-Gly¹, Glu(NH-hexyl)^(3,19))hGhrelin(1-28)-NH₂; (SEQ ID NO: 309) (Ac-Gly¹, Glu(NH-hexyl)³, Ser(n-octanoyl)¹⁹) hGhrelin(1-28)-NH₂; (SEQ ID NO: 310) (Ac-Gly¹, Aib², Glu(NH-hexyl)¹⁹)hGhrelin(1-28)- NH₂; (SEQ ID NO: 311) (Ac-Gly¹, Aib², Glu(NH-hexyl)^(3,19))hGhrelin(1-28)- NH₂; (SEQ ID NO: 312) (Ac-Gly¹, Aib^(2,8), Glu(NH-hexyl)¹⁹)hGhrelin(1-28)- NH₂; (SEQ ID NO: 313) (Ac-Gly¹, Aib^(2,8), Glu(NH-hexyl)^(3,19))hGhrelin(1- 28)-NH₂; (SEQ ID NO: 314) (Ac-Gly¹, Aib^(2,10), Glu(NH-hexyl)¹⁹)hGhrelin(1-28)- NH₂; (SEQ ID NO: 315) (Ac-Gly¹, Aib^(2,10), Glu(NH-hexyl)^(3,19))hGhrelin(1- 28)-NH₂; (SEQ ID NO: 316) (Ac-Gly¹, Glu(NH-hexyl)²⁰)hGhrelin(1-28)-NH₂; (SEQ ID NO: 317) (Ac-Gly¹, Ser(n-octanoyl)²⁰)hGhrelin(1-28)-NH₂; (SEQ ID NO: 318) (Ac-Gly¹, Glu(NH-hexyl)³,²⁰)hGhrelin(1-28)-NH₂; (SEQ ID NO: 319) (Ac-Gly¹, Glu(NH-hexyl)³, Ser(n-octanoyl)²⁰) hGhrelin(1-28)-NH₂; (SEQ ID NO: 320) (Ac-Gly¹, Aib², Glu(NH-hexyl)²⁰)hGhrelin(1-28)- NH₂; (SEQ ID NO: 321) (Ac-Gly¹, Aib², Glu(NH-hexyl)^(3,20))hGhrelin(1-28)- NH₂; (SEQ ID NO: 322) (Ac-Gly¹, Aib^(2,8), Glu(NH-hexyl)²⁰)hGhrelin(1-28)- NH₂; (SEQ ID NO: 323) (Ac-Gly¹, Aib^(2,8), Glu(NH-hexyl)^(3,20))hGhrelin(1- 28)-NH₂; (SEQ ID NO: 324) (Ac-Gly¹, Aib^(2,10), Glu(NH-hexyl)²⁰)hGhrelin(1-28)- NH₂; (SEQ ID NO: 325) (Ac-Gly¹, Aib^(2,10), Glu(NH-hexyl)^(3,20))hGhrelin(1- 28)-NH₂; (SEQ ID NO: 326) (Asp³(NH-heptyl))hGhrelin(1-28)-NH₂Example #86 (SEQ ID NO: 327) (des-Ser²)hGhrelin(1-28)-NH₂; Example #104 or (SEQ ID NO: 328) (des-Gly¹, des-Ser²)hGhrelin(1-28)-NH₂; Example #117 (SEQ ID NO: 329) (Aib¹)hGhrelin(1-28)-NH₂; Example #6 (SEQ ID NO: 326) (Asp³(O-hexyl))hGhrelin(1-28)-NH₂; Example #40 (SEQ ID NO: 329) (Aib¹, Ser³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 3) (A5c⁵, Ser³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 330) (Aib^(2,4), Ser³, 4-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 95) (n-octanoyl-Gly¹, Ser³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 95) (isobutyryl-Gly¹, Ser³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 95) (n-butyryl-Gly¹, Ser³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 331) (Aib¹, Thr³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 330) (Aib^(2,4), Thr³, 4-Pal⁹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 332) (n-octanoyl-Gly¹, Thr³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 332) (isobutyryl-Gly¹, Thr³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 332) (n-butyryl-Gly¹, Thr³)hGhrelin(1-28)-NH₂; (SEQ ID NO: 95) (Ac-Gly¹)hGhrelin(1-28)-NH₂; (SEQ ID NO: 95) (Ac-Gly¹, Ser³)hGhrelin(1-28)-NH₂,  (SEQ ID NO: 333) Aib², Lys(Myristyl)¹⁷)hGhrelin-(1-28)-NH₂; or  (SEQ ID NO: 334) Gly(myristyl)¹-(Aib², Lys(Myristyl)^(17])hGhrelin- (1-28)-NH₂;

The present invention includes diastereomers as well as their racemic and resolved enantiomerically pure forms. Ghrelin analogs can contain D-amino acids, L-amino acids or a combination thereof. Preferably, amino acids present in a ghrelin analog are the L-enantiomers.

Preferred derivatives of analogs of the invention comprise D-amino acids, N-alkyl-amino acids, β-amino acids and/or one or more labeled amino acids (including a labeled version of a D-amino acid, N-alkyl-amino acids, or a β-amino acid). A labeled derivative indicates the alteration of an amino acid or amino acid derivative with a detectable label. Examples of detectable labels include luminescent, enzymatic and radioactive labels. Both the type of label and the position of the label can affect analog activity. Labels should be selected and positioned so as not to substantially alter the activity of the ghrelin analog at the GHS receptor. The effect of a particular label and position on ghrelin activity can be determined using assays measuring ghrelin activity and/or binding.

A therapeutically effective amount depends upon the condition being treated, the route of administration chosen, and the specific activity of the compound used and ultimately will be decided by the attending physician or veterinarian (e.g., between 5 g/day to 5 mg/day). In one embodiment, the peptidyl analog of ghrelin is administered to the patient until the symptoms associated with gastrointestinal dysmotility, for example the abdominal nausea, distension, vomiting, obstipation, inability to eat and cramps often associated with postoperative ileus, observed in patient have been alleviated or ceased.

The ileus treatable by the method of the invention can be ileus of any portion of the gastrointestinal tract, e.g., the stomach, small intestine and/or the colon. The ileus can result from any factor that causes ileus, e.g., surgery, e.g., abdominal surgery such as transplantation surgery (e.g., small intestinal transplantation (SITx)) or abdominal surgery other than transplantation surgery (e.g., abdominal surgery involving laparotomy or not involving laparotomy, e.g., laproscopic procedures); orthopedic surgeries (e.g., hip surgery); parturition; intestinal ischaemia; retroperitoneal haematoma; intraabdominal sepsis; intraperitoneal inflammation, e.g., acute appendicitis, choecystitis, pancreatitis; fractures of the spine; ureteric colic; thoracic lesions; basal pneumonia; rib fractures; myocardial infarction; metabolic disturbances; or any combination thereof.

The peptidyl analog of ghrelin may be injected parenterally, e.g., intravenously, into the bloodstream of the subject being treated, however, it will be readily appreciated by those skilled in the art that the route, such as intravenous, subcutaneous, intramuscular, intraperitoneal, enterally, transdermally, transmucously, sustained released polymer compositions (e.g., a lactic acid polymer or copolymer microparticle or implant), profusion, nasal, oral, etc., will vary with the condition being treated and the activity and bioavailability of the peptidyl analog of ghrelin being used.

While it is possible for the peptidyl analog of ghrelin to be administered as the pure or substantially pure compound, it may also be presented as a pharmaceutical formulation or preparation. The formulations to be used in the present invention, for both humans and animals, comprise any of the peptidyl analog of ghrelin to be described below, together with one or more pharmaceutically acceptable carriers thereof, and optionally other therapeutic ingredients.

The carrier must be “acceptable” in the sense of being compatible with the active ingredient(s) of the formulation (e.g., capable of stabilizing peptides) and not deleterious to the subject to be treated. Desirably, the formulation should not include oxidizing agents or other substances with which peptides are known to be incompatible. Highly oxidative conditions can lead to the formation of cysteine sulfoxide and to the oxidation of tryptophan. Consequently, it is important to carefully select the excipient.

The pharmaceutical formulation can be administered to the patient by any method known in the art for administering gases, liquids, and/or solids to patients, e.g., via inhalation, insufflation, infusion, injection, and/or ingestion. For example, in one embodiment of the present invention, the pharmaceutical composition is administered to the patient by inhalation. In another embodiment, the pharmaceutical composition is administered to the patient orally. In yet another embodiment, the pharmaceutical composition is administered directly to the abdominal cavity of the patient.

The formulations may conveniently be presented in unit dosage form and may be prepared by any of the methods well known in the art of pharmacy. All methods include the step of bringing the active ingredient(s) into association with the carrier which constitutes one or more accessory ingredients.

In general, the formulations for tablets or powders are prepared by uniformly and intimately blending the active ingredient with finely divided solid carriers, and then, if necessary, as in the case of tablets, forming the product into the desired shape and size.

Formulations suitable for parenteral (e.g., intravenous) administration, on the other hand, conveniently comprise sterile aqueous solutions of the active ingredient(s). Preferably, the solutions are isotonic with the blood of the subject to be treated. Such formulations may be conveniently prepared by dissolving solid active ingredient(s) in water to produce an aqueous solution, and rendering said solution sterile. The formulation may be presented in unit or multi-dose containers, for example, sealed ampoules or vials.

Formulations suitable for sustained release parenteral administrations (e.g., biodegradable polymer formulations such as polyesters containing lactic or glycolic acid residues) are also well known in the art (see, e.g., U.S. Pat. Nos. 3,773,919 and 4,767,628 and PCT Publication WO 94/15587).

In addition to treating postoperative ileus, patients suffering from ileus undergoing the method of the instant application also benefit from other known therapeutic effects of ghrelin such as orexigenic effects, inhibition of inflammatory cytokines, promotion of slow wave sleep and immune enhancing properties.

EXAMPLES A. Synthesis of Ghrelin Analogs

The ghrelin analogues and compounds of the invention can be produced using the techniques disclosed in the examples herein as well as techniques that are well known in the art. For example, a polypeptide region of a ghrelin analog can be chemically or biochemically synthesized and modified. Examples of techniques for biochemical synthesis involving the introduction of a nucleic acid into a cell and expression of nucleic acids are provided in Ausubel, Current Protocols in Molecular Biology, John Wiley, 1987-1998 and Sambrook et al., in Molecular Cloning, A Laboratory Manual, 2^(nd) Edition, Cold Spring Harbor Laboratory Press, 1989. Techniques for chemical synthesis of polypeptides are also well known in the art (See e.g., Vincent in Peptide and Protein Drug Delivery, New York, N.Y., Dekker, 1990). For example, the peptides of this invention can be prepared by standard solid phase peptide synthesis (See, e.g., Stewart, J. M., et al., Solid Phase Synthesis, Pierce Chemical Co., 2d ed. 1984).

The substituents R² and R³ of the above generic formula may be attached to the free amine of the N-terminal amino acid by standard methods known in the art. For example, alkyl groups, e.g., (C₁-C₃₀)alkyl, may be attached using reductive alkylation. Hydroxyalkyl groups, e.g., (C₁-C₃₀)hydroxyalkyl, may also be attached using reductive alkylation wherein the free hydroxy group is protected with a t-butyl ester. Acyl groups, e.g., COD, may be attached by coupling the free acid, e.g., E¹COOH, to the free amine of the N-terminal amino acid by mixing the completed resin with 3 molar equivalents of both the free acid and diisopropylcarbodiimide in methylene chloride for 1 hour. If the free acid contains a free hydroxy group, e.g., p-hydroxyphenylpropionic acid, then the coupling should be performed with an additional 3 molar equivalents of HOBT.

When R¹ is NH—X²—CH₂—CONH₂, (i.e., Z⁰═CONH₂), the synthesis of the peptide starts with Fmoc-HN—X²—CH₂—COOH coupled to a Rink Amide-MBHA resin (Amide-4-methylbenzylhydryl amine obtained from Novabiochem®, San Diego, Calif.). If R¹ is NH—X²—CH₂—COOH (i.e., Z⁰—COOH) the synthesis of the peptide starts with Fmoc-HN—X²—CH₂—COOH which is coupled to Wang resin.

In the synthesis of a ghrelin analogue of this invention containing A5c, A6c and/or Aib, the coupling time is 2 hours for these residues and the residue immediately following them.

A protecting group covalently joined to the C-terminal carboxy group reduces the reactivity of the carboxy terminus under in vivo conditions. The carboxy terminus protecting group is preferably attached to the α-carbonyl group of the last amino acid. Preferred carboxy terminus protecting groups include amide, methylamide, and ethylamide.

Examples are provided below to further illustrate different features of the present invention. The examples also illustrate useful methodology for practicing the invention. These examples do not limit the claimed invention.

Synthesis of short amino acid sequences is well established in the peptide art. For example, synthesis of compounds according to formula I such as (Glu³(O-hexyl))hGhrelin(1-28)-NH₂ (SEQ ID NO:1), (Aib²)hGhrelin(1-28)-NH₂ (SEQ ID NO:10), (Glu³(NH-hexyl))hGhrelin(1-28)-NH₂ (SEQ ID NO:1) and (Cys³(S-decyl))hGhrelin(1-28)-NH₂ (SEQ ID NO:1) described above, can be achieved by following the protocol set forth in International Patent Publication WO04/009616 at pages 46 to 56 at follows:

Example 1 (Glu³(O-Hexyl))hGhrelin(1-28)-NH₂ (SEQ ID NO:1)

The titled peptide was synthesized on an Applied Biosystems (Foster City, Calif.) model 433A peptide synthesizer. 4-(2′,4′-Dimethoxyphenyl-Fmoc-aminomethyl)-phenoxyacetamido-norleucyl-MBHA resin (Rink Amide MBHA resin, Novabiochem, San Diego, Calif.) was used with a substitution of 0.72 mmol/g. The Fmoc amino acids (AnaSpec, San Jose, Calif.) were used with the following side chain protection: Fmoc-Arg(Pbf)-OH, Fmoc-Pro-OH, Fmoc-Gln-OH, Fmoc-Leu-OH, Fmoc-Lys(Boc)-OH, Fmoc-Ala-OH, Fmoc-Ser(tBu)-OH, Fmoc-Glu(OtBu)-OH, Fmoc-Val-OH, Fmoc-His(Trt)-OH, Fmoc-Phe-OH, and Fmoc-Asp(OtBu)-OH. Boc-Gly-OH (Midwest Bio-Tech, Fishers, Ind.) was used in position 1. N-α-Fmoc-L-glutamic acid γ-4-{N-(1-(4,4-dimethyl-2,6-dioxocyclohexylidene)-3-methylbutyl)-amino}benzyl ester (Fmoc-Glu(ODmab)-OH) (Chem-Inpex International, Wood Dale, Ill.) was used in position 3. The synthesis was carried out on a 0.25 mmol scale. The Fmoc groups were removed by treatment with 20% piperidine in N-methylpyrrolidone (NMP) for 30 min. In each coupling step, the Fmoc amino acid (1 mmol) was first pre-activated with HBTU (0.9 mmol) and HOBt (0.9 mmol) in DMF and then added to the resin. The ABI 433A peptide synthesizer was programmed to perform the following reaction cycle: (1) washing with NMP, (2) removing Fmoc protecting group with 20% piperidine in NMP for 30 min, (3) washing with NMP, (4) coupling with pre-activated Fmoc amino acid for 1 h.

At the end of assembly of the peptide chain on the Applied Biosystems (ABI) 433A peptide synthesizer, the resin was transferred into a reaction vessel on a shaker for manual synthesis. The Dmab protecting group in the side chain of the Glu residue was removed with a solution of 2% hydrazine in DMF for 2 h. After washing with DMF, the resin was treated with 2.5 mmol of tetramethylfluoroforamidinium hexafluorophosphate (TFFH) (Perseptive Biosystems, Warrington, UK) in dichloromethane (DCM) for 25 min to convert the free carboxylic acid functional group in the side chain of the Glu residue to its acid fluoride. To the mixture were added 5.0 mmol of hexanol, 2.5 mmol of O-(7-azabenzotriazol-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate (HOAT)(Anaspec, San Jose, Calif.), 5.0 mmol of diisopropylethyl amine (DIEA)(Aldrich, Milwaukee, Wis.) and catalytic amount of 4-(dimethylamino)pyridine (DMAP)(Aldrich, Milwaukee, Wis.). The mixture was shaken at room temperature for 2 h. The resin was washed with DMF and DCM and treated overnight with 2.5 mmol of N, N-diisopropylcarbodiimide (DIC)(Chem-Impex International, Wood Dale, Ill.), 2.5 mmol of 1-hexanol, 2.5 mmol of HOBt, and 0.025 mmol of DMAP. After washing and drying, the peptide was cleaved off from the resin by using a mixture of TFA (9.5 mL), H₂O (0.85 mL) and triisopropylsilane (TIS) (0.85 mL) for 2 h. The resin was filtered off and the filtrate was poured into 70 mL of ether. The precipitate formed was filtered off and washed thoroughly with ether. This crude product was dissolved into 5% acetic acid and purified on a reverse-phase preparative HPLC using a column (4×43 cm) of C₁₈ DYNAMAX-100A⁰ (Varian, Walnut Creek, Calif.). The column was eluted with a linear gradient from 75% A and 25% B to 55% A and 45% B in an hour where A was 0.1% TFA in water and B was 0.1% TFA in acetonitrile. The fractions were checked by an analytical HPLC. Those containing pure product were combined and lyophilized to dryness. The purity of the compound was 92.8%. Yield was 8.6%. Electro-spray ionization mass spectrometry (ESI MS) analysis gave a molecular weight for the product of 3369.4 (in agreement with the calculated molecular weight of 3369.9).

Example 2 (Aib²)hGhrelin(1-28)-NH₂ (SEQ ID NO:10)

The titled peptide was synthesized according to the procedure described in Example 1 for the synthesis of (Glu³(O-Hexyl))hGhrelin(1-28)-NH₂ (SEQ ID NO:1), except as follows: Fmoc-Ser-OH was used at position 3, Fmoc-Aib-OH was used at position 2 and Boc-Gly-OH was used at position 1. After the peptide chain was assembled, the peptide-resin was treated with 25% piperidine in DMF for 3×2 h. The resin was washed with DMF and treated with octanoic acid (2.5 mmol, 10 fold excess), HBTU (2.2 mmol), HOBt (2.2 mmol) and DIEA (7.5 mmol) in DMF for 2 h. The resin was washed with DMF and then treated with octanoic acid (2.5 mmol), DIC (2.5 mmol), HOBt (2.5 mmol) and DMAP (0.025 mmol) in DMF for 2 h. The final cleavage and purification procedures were the same as those in Example 1. The product was found to be homogenous by analytical HPLC, with a purity of 99% in 18.5% yield. Electro-spray ionization mass spectrometry (ESI MS) analysis gave a molecular weight for the product of 3367.6 (in agreement with the calculated molecular weight of 3367.0).

Example 3 (Glu³(NH-Hexyl))hGhrelin(1-28)-NH₂ (SEQ ID NO:1)

The titled peptide was synthesized on an Applied Biosystems (Foster City, Calif.) model 430A peptide synthesizer which was modified to do accelerated Boc-chemistry solid phase peptide synthesis. See Schnolzer, et al., Int. J. Peptide Protein Res., 40:180 (1992). 4-Methylbenzhydrylamine (MBHA) resin (Peninsula, Belmont, Calif.), with a substitution of 0.91 mmol/g was used. Boc amino acids (Midwest Bio-Tech, Fishers, Ind.; Novabiochem., San Diego, Calif.) were used with the following side chain protection: Boc-Ala-OH, Boc-Arg(Tos)-OH, Boc-His(DNP)-OH, Boc-Val-OH, Boc-Leu-OH, Boc-Gly-OH, Boc-Gln-OH, Boc-Lys(2ClZ)-OH, Boc-Ser(Bzl)-OH, Boc-Phe-OH, Boc-Glu(OcHex)-OH and Boc-Pro-OH. Fmoc-Glu(OtBu)-OH (Novabiochem., San Diego, Calif.) was used for the residue at position 3 in the sequence. The synthesis was carried out on a 0.25 mmol scale. The Boc groups were removed by treatment with 100% TFA for 2×1 min. Boc amino acids (2.5 mmol) were pre-activated with HBTU (2.0 mmol) and DIEA (1.0 mL) in 4 mL of DMF and were coupled without prior neutralization of the peptide-resin TFA salt. Coupling times were 5 min.

At the end of the assembly of the first 25 residues on the ABI 430A peptide synthesizer and before the coupling of Fmoc-Glu(OtBu)-OH, the protected peptide-resin was transferred into a reaction vessel on a shaker for manual synthesis. After removing the Boc protecting group by using 100% TFA for 2×1 min and washing with DMF, the resin was mixed with Fmoc-Glu(OtBu)-OH (2.5 mmol) which was pre-activated with HBTU (2.0 mmol), HOBt (2.0 mmol) and DIEA (1.0 mL) in 4 mL of DMF. The mixture was shaken for 2 h. This coupling step was repeated. After washing with DMF, the resin was treated with a TFA solution containing 5% water and 5% TIS for 2 h to remove the tBu protecting group in the side chain of the Glu residue. The resin was neutralized with 10% DIEA in DMF and washed with DMF and DCM. The resin was then treated with hexylamine (2.0 mmol), DIC (2.0 mmol), HOBt (2.0 mmol) in 5 ml of DCM for 2×2 h. The resin was washed with DMF and treated with 25% piperidine in DMF for 30 min to remove the Fmoc protecting group. After washing with DMF and DCM, the resin was transferred into the reaction vessel on the ABI 430A peptide synthesizer for the assembly of the rest two residues.

At the end of the assembly of the whole peptide chain, the resin was treated with a solution of 20% mercaptoethanol/10% DIEA in DMF for 2×30 min to remove the DNP group on the His side chain. The N-terminal Boc group was then removed by treatment with 100% TFA for 2×2 min. The peptide-resin was washed with DMF and DCM and dried under reduced pressure. The final cleavage was done by stirring the peptide-resin in 10 mL of HF containing 1 mL of anisole and dithiothreitol (50 mg) at 0° C. for 75 min. HF was removed by a flow of nitrogen. The residue was washed with ether (6×10 mL) and extracted with 4N HOAc (6×10 mL). This crude product was purified on a reverse-phase preparative HPLC using a column (4×43 cm) of C₁₈ DYNAMAX-100A⁰ (Varian, Walnut Creek, Calif.). The column was eluted with a linear gradient from 75% A and 25% B to 55% A and 45% B at flow rate of 10 mL/min in an hour where A was 0.1% TFA in water and B was 0.1% TFA in acetonitrile. Fractions were collected and checked on an analytical HPLC. Those containing pure product were combined and lyophilized to dryness. 31.8 mg of a white solid were obtained. Purity was 89% based on analytical HPLC analysis. Electro-spray ionization mass spectrometry (ESI MS) analysis gave the molecular weight at 3368.4 (in agreement with the calculated molecular weight of 3368.9).

Example 4 (Cys³(S-Decyl))hGhrelin(1-28)-NH₂ (SEQ ID NO:1)

(i) The titled peptide was synthesized according to the procedure described in Example 3 for the synthesis of (Glu³(NH-Hexyl))hGhrelin(1-28)-NH₂ (SEQ ID NO:1) with the following modifications: After the assembly of the first 25 residues using Boc chemistry, the last 3 residues were assembled by employing Fmoc chemistry. The following 3 Fmoc amino acids were used: N-α-Fmoc-S-(p-methoxytrityl)-L-cysteine (Fmoc-Cys(Mmt)-OH), Fmoc-Ser(Bzl)-OH and Fmoc-Gly-OH, which were purchased from Novabiochem (San Diego, Calif.). The Fmoc amino acid (1 mmol) was first pre-activated with HBTU (0.9 mmol) and HOBt (0.9 mmol) in DMF before it was coupled to the peptide-resin. The synthesis cycle for the Fmoc amino acids included: (1) washing with NMP, (2) removing Fmoc protecting group with 20% piperidine in NMP for 30 min, (3) washing with NMP, and (4) coupling with pre-activated Fmoc amino acid for 1 h.

(ii) At the end of the assembly of the entire peptide chain, the protected peptide-resin was treated with a solution of 20% mercaptoethanol and 10% DIEA in DMF for 2×30 min to remove the DNP group on the side-chain of the His residue. The Mmt protecting group in the side-chain of the Cys residue was then removed by using a solution of 1% TFA and 5% TIS in DCM for 30 minutes and the peptide-resin was washed with DMF.

(iii) 1-(2-pyridyldithio)decane was prepared by stirring 2,2′-dipyridyl disulfide (1.06 g, 4.8 mmol), 1-decanethiol (0.83 mL, 4 mmol) and triethylamine (2 mL) in propanol and acetonitrile (1/9, v/v) at room temperature for about 3 hours (See Carlsson et al., Biochem. J., 1978, 173, 723-737). Purification of the crude 1-(2-pyridyldithio)decane was performed using flash chromatography, eluting with a mixed solvent system of DCM/MeOH (10:0.4).

(iv) The peptide-resin from step (ii) was treated with the 1-(2-pyridyldithio)decane from step (iii) and DIEA (3 eq., 0.75 mmol) overnight in a mixed solvent system of DMF/1-propanol (7:3). The resin was then washed with DMF and the N-terminal Fmoc protecting group was removed by treatment with 25% piperidine in DMF for 30 min. The peptide-resin was then washed with DMF and DCM and dried under reduced pressure.

(v) Final cleavage was performed by stirring the peptide-resin in 10 mL of HF containing 1 mL anisole at about 0° C. for about 70 min. The purification procedure was the same as that described in Example 3. The target product (yield 10.2%) was found by analytical HPLC to have a purity of 99.9%. Electro-spray ionization mass spectrometry (ESI-MS) analysis gave the molecular weight at 3432.1 (in agreement with the calculated molecular weight of 3432.1).

Other peptides of the invention can be prepared by a person of ordinary skill in the art using synthetic procedures analogous to those disclosed generally hereinabove in using the protocols set forth in International Patent Publication WO04/009616. Other peptides of the invention can be prepared by a person of ordinary skill in the art using synthetic procedures analogous to those disclosed generally hereinabove.

The synthesis of peptidyl analogs according to formula II, such as H-Inp-D-Bal-D-Trp-Phe-Apc-NH₂ (SEQ ID NO:122), H-Inp-D-2-Nal-D-Trp(Ψ)-Pim (SEQ ID NO:126) and H-Inp-D-Trp-D-2-Nal(Ψ)-Pim (SEQ ID NO:120) can be achieved by following the protocol set forth in International Patent Publication WO04/014415 at pages 33-44 as follows:

Example 1 H-Apc-D-1-Nal-D-1-Nal-Phe-Apc-NH₂ (SEQ ID NO:129)

Each of the reaction wells contained 0.0675 mmol of Rink Amide MBHA resin (substitution=0.72 mmol/g, Novabiochem, San Diego, Calif.). The following Fmoc amino acids (Novabiochem, San Diego, Calif.; Chem-Impex International, Wood Dale, Ill.; SyntheTech, Albany, Oreg.; Pharma Core, High Point, N.C.) were used: Fmoc-Lys(Boc)-OH, Fmoc-Phe-OH, Fmoc-H-Inp-OH, Fmoc-D-1-Nal-OH, Fmoc-D-2-Nal-OH, Fmoc-D-Trp(Boc)-OH, Fmoc-3-Pal-OH, Fmoc-4-Pal-OH, Fmoc-Orn(Boc)-OH, Fmoc-D-Bip-OH, Fmoc-Thr(Bzl)-OH, Fmoc-Pff-OH, Fmoc-2-Thi-OH, Fmoc-Taz-OH, Fmoc-D-Dip-OH, Fmoc-D-Bpa-OH, Fmoc-D-Bal-OH, and Fmoc-Apc(Boc)-OH.

Each of the Fmoc amino acids was dissolved in a 0.3 N solution of HOBt in DMF wherein the concentration of the resulting Fmoc amino acid was 0.3 N. A four fold excess (0.27 mmol, 0.9 mL of the 0.3 N solution) of Fmoc amino acid was used for each coupling. DIC (0.27 mmol, 0.6 mL of 0.45N DIC solution in DMF) was used as the coupling reagent for each coupling. Deprotection was performed by using 20% piperidine in DMF (2×1.5 mL per residue).

The peptides were cleaved from the resin by treating the peptide-resins with 8% triisopropylsilane (TIP) in trifluoroacetic acid (TFA) (1.5 mL per reaction well) at room temperature for 2 h. The resin was removed by filtration. Each filtrate was diluted to 25 mL with ether in a centrifuge tube. The resulting precipitate in each tube was centrifuged and the solvents were decanted from the precipitate. The precipitate in each tube was then dissolved in methanol (3 mL) and diluted with water (1 mL). The purification of the crude products was done on a reverse-phase preparative HPLC using a column (100×21.20 mm, 5μ) of LUNA 5μ C8(2) (Phenomenex, Torrance, Calif.). For each peptide, the column was eluted with a linear gradient from 85% A and 15% B to 25% A and 75% B in 15 min with a flow rate of 25 mL/min. A was 0.1% TFA in water and B was 0.1% TFA in acetonitrile/water (80/20, v/v). The fractions were checked by analytical HPLC and those containing the pure product were combined and lyophilized to dryness.

Yields ranged from 13% to 71% and purity of each of Examples 1-65 exceeded 94% based upon analytical HPLC analysis. Electro-spray ionization mass spectrometry (ES-MS) analysis was performed and observed molecular weights were in agreement with calculated molecular weights. The results are detailed in Table I, below.

Example 2 H-Inp-D-2-Nal-D-Trp(Ψ)-Pim (SEQ ID NO:126)

1.a. BOC-(D)-Trp-OH (4.0 g, 13.1 mmole) (Novabiochem San Diego, Calif.) in methanol (36 ml) and Cs₂CO₃ (2.14 g, 6.57 mmole) in water (10 ml) were combined and the mixture was swirled until a homogeneous mixture was obtained. Solvents were removed in vacuo and the residue was dissolved in DMF (45 ml). 2-bromoacetophenone (2.61 g, 13.1 mmole) in DMF (9 ml) was added to the solution and the solution was stirred for 30 min. at room temperature. Cesium bromide was removed by filtration and the filtrate was concentrated in vacuo. The resulting concentrate was dissolved in xylenes (45 ml), NH₄OAc (17.1 g) was added, and the solution was heated at reflux for 1 hr. The cooled solution was washed two times with saturated NaHCO₃ solution (45 ml) and then with saturated NaCl. The resulting organic layer was purified by flash chromatography to yield 4.1 g (77%) of intermediate 1A depicted in Scheme 1A, (“Compound 1A”).

1b. Compound 1A (403 mg) was deblocked using a mixture of trifluoroacetic acid (TFA) (8 ml) dichloromethane (DCM) (8 ml) and triisopropylsilane (TIPS) (1.4 ml). After mixing for one hour the solution was concentrated under a stream of nitrogen. The residue was dissolved in DCM (40 ml), washed two times with a saturated solution of NaHCO₃ (40 ml), and then dried over Na₂SO₄ to yield a solution of the intermediate product 1B, depicted in Scheme 1B, below.

1c.-f. The forgoing solution of the intermediate product 1B was divided into four equal portions and coupled with the pre-activated HOBT esters of FMOC protected amino acids, as summarized in reaction schemes 1C, 1D, 1E, and 1F, below. The amino acid used: FMOC-D-2-Nal-OH (130 mg, 0.30 mmole) (Synthetech Albany, Oreg.)

Each of the immediately foregoing amino acids was pre-activated with HOBT (46 mg, 0.30 mmole) and DIC (38 mg, 0.30 mmole) in DCM (5 ml) for ten minutes before addition to one of the four portions of the forgoing solution of the intermediate product 1B. The coupling reaction was then allowed to proceed for 30 minutes at room temperature.

1.g-j. The FMOC group is removed from each of the resulting compounds 1C, 1D, 1E and 1F by addition of tris(2-aminoethyl)amine (0.9 ml) to the respective reaction mixtures from the previous step and mixing for 30 minutes at room temperature. The reaction mixtures containing the deblocked compounds were then washed three times with 10% pH 5.5 phosphate buffer (10 ml).

The resulting free amine solutions were coupled with pre-activated HOBT esters of FMOC-Inp-OH (105 mg, 0.30 mmole) (Chem Impex Wood Dale, Ill.) and was pre-activated with HOBT (46 mg, 0.30 mmole) and DIC (38 mg, 0.30 mmole) in DCM (5 ml) for ten minutes before addition to the appropriate deprotected amine. The coupling reaction was then allowed to proceed for one hour at room temperature.

The FMOC group was removed from the resulting FMOC-protected compounds by addition of tris(2-aminoethyl)amine (0.9 ml) and mixing for 30 minutes. The deblocked compounds were washed three times with 10% pH 5.5 phosphate buffer (10 ml) and the crude products were collected as a precipitate.

The BOC-protected compounds were purified by flash chromatography and then deblocked for one hour with TIPS (0.50 ml), TFA (0.50 ml), in DCM (2.75 ml). The crude products were then concentrated and dried under vacuum.

The foregoing deprotection, coupling, and deprotection steps are summarized in reaction schemes 1G, 1H, 1I and 1J, below

Example 3 H-Inp-D-Trp-D-2-Nal(Ψ)-Pim (SEQ ID NO:120)

2.a.1 and 2.a.2.: Compound 2A was made in an analogous manner as was Compound 1A, using BOC-D-2-Nal-OH and 2-bromoacetophenone as starting materials.

Steps 2.a.1. and 2.a.2. are summarized in Scheme 2A, below.

2.b.1. Compound 2A (100 mg, 0.242 mmole) was deblocked in TFA (2 ml) and DCM (2 ml) for one hour. Volatiles were then removed under a stream of nitrogen and the residue was dissolved in DCM (10 ml). The resulting solution washed three times with saturated NaHCO₃ (10 ml) to yield a solution of Compound 2A in free amine form.

2.b.2. The active ester of FMOC-D-Trp-(BOC)-OH (153 mg, 0.290 mmole) was preformed with N-hydroxysuccinimide (HOSu; 33 mg, 0.290 mmole) and DIC (37 mg, 0.290 mmole) in DCM (1.5 ml). After one hour diisopropylurea was removed by filtration and the filtrate was added to the Compound 2A (free amine) solution. The resulting solution was diluted with DCM to 4 ml and the coupling reaction allowed to proceed for 30 minutes.

Steps 2.b.1. and 2.b.2. are summarized in Scheme 2B, below.

2.c.1 Compound 2B was deblocked by addition of tris(2-aminoethyl)amine (TAEA) (0.9 ml) to the immediately foregoing coupling reaction solution and mixing for 30 minutes at room temperature. The reaction solution was then washed three times with saturated NaCl solution (10 ml) followed by three times with 10% pH 5.5 phosphate buffer (10 ml) to yield a solution of Compound 2B in free amine form.

2.c.2. The active ester of BOC-Inp-OH (66.5 mg, 0.290 mmole) was preformed with HOSu (33 mg, 0.290 mmole) and DIC (37 mg 0.290 mmole) in DCM (1.5 ml). After one hour diisopropylurea was removed by filtration and the filtrate was added to the Compound 2B (free amine) solution. The resulting solution was diluted with DCM to 4 ml and the coupling reaction was allowed to proceed for 12 hours.

The reaction mixture was then washed three times with 10% pH 5.5 phosphate buffer (10 ml) and dried over Na₂SO₄. Solvent was removed under vacuum and the concentrate was purified by flash chromatography.

2.c.3. The intermediate was deblocked using TFA (2.75 ml) and TIPS (0.5 ml) in DCM (2.75 ml) for 30 minutes. Volatiles were removed from the reaction mixture under a stream of nitrogen and the residue was triturated with ether (15 ml). After centrifugation the ether was decanted and the resulting solid was subjected to HPLC to yield purified Compound 70 in 39% yield.

Steps 2.c.1. and 2.c.2. and 2.c.3. are summarized in Scheme 2C, below.

Additional examples for synthesizing compounds according to formula III are provided below to further illustrate different features of the present invention. The examples also illustrate useful methodology for practicing the invention. These examples do not limit the claimed invention.

(Ac-Aib¹, Aib²⁻¹⁰, Glu(NH-hexyl)^(3,17))hGhrelin(1-28)-NH₂ (SEQ ID NO:272)

The title peptide was synthesized on an Applied Biosystems® model 433A peptide synthesizer (obtained from Applied Biosystems®, Foster City, Calif., U.S.A.) using Fluorenylmethyloxycarbonyl (Fmoc) chemistry. A Rink Amide-4-methylbenzylhydrylamine (MBHA) resin (obtained from Novabiochem®, San Diego, Calif.) with substitution of 0.64 mmol/g was employed. The Fmoc amino acids (obtained from AnaSpec®, San Jose, Calif., U.S.A.) used were Fmoc-Ala-OH, Fmoc-Arg(Pbf)-OH, Fmoc-Aib-OH, Fmoc-Gln(Trt)-OH, Fmoc-Glu(tBu)-OH, Fmoc-His(Trt)-OH, Fmoc-Leu-OH, Fmoc-Lys(Boc)-OH, Fmoc-Phe-OH, Fmoc-Pro-OH, Fmoc-Ser(tBu)-OH and Fmoc-Val-OH. In addition, Fmoc-Glu(O-2-PhiPr)-OH (obtained from Novabiochem®, San Diego, Calif.) was used for the amino acids in 3^(rd) and 17^(th) positions. The synthesis was carried out on a 0.1 mmol scale. The Fmoc groups were removed by treating the resin with a solution of 20% piperidine in N-methylpyrrolidone (NMP) for a period of approximately 30 minutes. In each coupling step, the Fmoc amino acid (3 eq, 0.3 mmol) was first pre-activated in 2 mL solution of 0.45M 2-(1-H-benzotriazole-1-yl)-1,1,2,3-tetramethyluronium-hexafluorophosphate/1-hydroxy-benzotriazole (HBTU/HOBT) in NMP. A solution containing the activated amino acid ester together with 1 mL of diisopropylethylamine (DIEA) and 1 mL of NMP was introduced to the resin. The ABI 433A® peptide synthesizer was programmed to perform the following reaction cycle:

(1) washing with NMP; (2) removing Fmoc protecting group with 20% piperidine in NMP for 30 minutes; (3) washing with NMP; and (4) coupling with pre-activated Fmoc amino acid for approximately 1 or 3 hours. The resin was coupled successively according to the sequence of the title peptide. After the peptide chain was assembled, the resin was washed completely with N,N-dimethylformamide (DMF) and dichloromethane (DCM).

At the end of the assembly of the peptide chain on the ABI 433A® peptide synthesizer (without the Fmoc-Aib residue in A¹), the peptide-resin was transferred to a reaction vessel on a shaker and the Fmoc was removed using 25% piperidine in DMF for 30 minutes. The resin was then washed with DMF. The Fmoc-Aib-OH (0.4 mmole) was coupled using TFFH (Tetramethylfluoroformamidinium Hexafluorophosphate) (obtained from Perceptive Biosystems®, Warrington, U.K.) (0.4 mmole), HOAt (0.4 mmol), DMAP (Dimethylaminopyridine) (0.1 g) and DIEA (1.2 mmole) once for 4 hours and once overnight.

The Fmoc group was removed as above and the peptide was capped using Ac₂O (acetic anhydride) (5 mmole) and DIEA (5 mmole) in DMF for approximately 30 minutes. The PhiPr (γ-2-phenylisopropyl ester) groups were removed from the Glutamine residues at A³ and A¹⁷ by washing with a solution of 3% TFA in DCM twice for a period of 10 minutes for each washing. The Boc that was partially removed from the side chain of Lysine was replaced by using Boc₂O (0.8 mmole) and DIEA (0.8 mmole) in DCM overnight. The resin was treated with PyAOP (7-Azabenzotriazol-1-yloxytris(pyrrolidino)phosphonium-hexafluorophosphate) (obtained from Applied Biosystems®, Foster City, Calif., U.S.A.) (0.6 mmole), HOAt (0.6 mmole), DMAP (0.1 g) and DIEA (1.8 mmole) for 10 minutes. Hexyl-NH2(Hexylamine) (obtained from Sigma-Aldrich Chemicals®, St. Louis, Mo., U.S.A.) (2.0 mmole) was then added to the resin solution which was then shaken and allowed to stand overnight.

To cleave the title peptide from the resin, the peptide-resin was treated with a mixture of TFA, H₂O and triisopropylsilane (TIS) (9.5 mL/0.85 mL/0.8 mL, respectively) for approximately 4 hours. The cleaved resin was filtered off and the remaining filtrate was poured into 200 mL of ether. A precipitate formed which was then collected by centrifugation. The crude product was dissolved in a mixture of acetonitrile and water which was purified on a reverse-phase preparative HPLC system with a column (4×43 cm) of C₁₈ DYNAMAX-100 A⁰® (obtained from Varian®, Walnut Creek, Calif., U.S.A.). The column was eluted over approximately 1 hour using a linear gradient of 85% A:15% B to 60% A:40% B, where A was 0.1% TFA in water and B was 0.1% TFA in acetonitrile. The fractions were analyzed by HPLC and those fractions found to contain pure product were pooled and lyophilized to dryness. Approximately 27.1 mg (6.3%) of a white solid was recovered which was assayed using HPLC and found to be approximately 97.5% pure. Electro-spray ionization mass spectrometry (ESI-MS) analysis determined the molecular weight to be 3477.4 which was in agreement with the calculated molecular weight of 3477.19.

(Aib^(1,2,10), Glu(NH-hexyl)^(3,17))hGhrelin(1-28)-NH₂ (SEQ ID NO:212)

The titled peptide was synthesized according to the procedure described for Example 158, i.e., (Ac-Aib¹, Aib^(2,10), Glu(NH-Hexyl)^(3,17))hGhrelin(1-28)-NH₂) with the following exception: After coupling the last Fmoc-Aib-OH in the 1^(st) position on a shaker, the PhiPr protecting groups were removed from the Glutamine residues at A³ and A¹⁷ by washing with a 3% TFA in DCM twice for intervals lasting approximately 10 minutes. The Boc that was partially removed from the side chain of Lysine was replaced using a solution of Boc₂O (0.8 mmole) and DIEA (0.8 mmole) in DCM. After being shaken and standing overnight, the resin was treated with a solution of PyAOP (7-Azabenzotriazol-1-yloxytris(pyrrolidino)phosphonium-hexafluorophosphate) (obtained from Applied Biosystems®, Foster City, Calif., U.S.A.) (0.6 mmole), HOAt (0.6 mmole), DMAP (0.1 g) and DIEA (1.8 mmole) for 10 minutes after which Hexyl-NH2(Hexylamine) (obtained from Sigma-Aldrich, St. Louis, Mo., U.S.A.) (2.0 mmole) was then added to the solution which was then shaken and allowed to stand overnight. The Fmoc protecting group was then removed using 25% piperidine in DMF. The peptide was cleaved off from the resin and purified on a HPLC system, as detailed in the discussion of the synthesis of Example 158 above.

Using an HPLC assay, the purity of the resulting produce was found to be approximately 96.5%. Electro-spray ionization mass spectrometry (ESI-MS) analysis determined the molecular weight to 3435.00 which was in agreement with the calculated molecular weight of 3435.16.

B. Biological Assays

The activities of the compounds of the invention at the GHS receptor can be and were determined using techniques such as those described in the examples provided below. In different embodiments a ghrelin analog has at least about 50%, at least about 60%, at least about 70%, at least about 80%, or at least about 90%, at least about 95%, at least about 98% or more, functional activity relative to ghrelin as determined using one or more of the functional activity assays described below; and/or has an IC₅₀ greater than about 1,000 nM, greater than about 100 nM, or greater than about 50 nM, using the receptor binding assay described below. With respect to IC₅₀, greater refers to potency and thus indicates a lesser amount is needed to achieve binding inhibition.

Assays measuring the ability of a compound to bind a GHS receptor employ a GHS receptor, a fragment of the receptor comprising a ghrelin binding site, a polypeptide comprising such a fragment, or a derivative of the polypeptide. Preferably, the assay uses the GHS receptor or a fragment thereof.

A polypeptide comprising a GHS receptor fragment that binds ghrelin can also contain one or more polypeptide regions not found in a GHS receptor. A derivative of such a polypeptide comprises a GHS receptor fragment that binds ghrelin along with one or more non-peptide components.

The GHS receptor amino acid sequence involved in ghrelin binding can be readily identified using labeled ghrelin or ghrelin analogs and different receptor fragments. Different strategies can be employed to select fragments to be tested to narrow down the binding region. Examples of such strategies include testing consecutive fragments of about 15 amino acids in length starting at the N-terminus, and testing longer length fragments. If longer length fragments are tested, a fragment binding ghrelin can be subdivided to further locate the ghrelin binding region. Fragments used for binding studies can be generated using recombinant nucleic acid techniques.

Binding assays can be performed using individual compounds or preparations containing different numbers of compounds. A preparation containing different numbers of compounds having the ability to bind to the GHS receptor can be divided into smaller groups of compounds that can be tested to identify the compound(s) binding to the GHS receptor. In an embodiment of the present invention, a test preparation containing at least 10 compounds is used in a binding assay.

Binding assays can be performed using recombinantly produced GHS receptor polypeptides present in different environments. Such environments include, for example, cell extracts and purified cell extracts containing the GHS receptor polypeptide expressed from recombinant nucleic acid or naturally occurring nucleic acid; and also include, for example, the use of a purified GHS receptor polypeptide produced by recombinant means or from naturally occurring nucleic acid which is introduced into a different environment.

B.1 Screening for GHS Receptor Active Compounds

Screening for GHS receptor active compounds is facilitated using a recombinantly expressed receptor. Using a recombinantly expressed GHS receptor offers several advantages such as the ability to express the receptor in a defined cell system so that a response to a compound at the GHS receptor can be more readily differentiated from responses at other receptors. For example, the GHS receptor can be expressed in a cell line such as HEK 293, COS 7, or CHO not normally expressing the receptor by an expression vector, wherein the same cell line without the expression vector can act as a control.

Screening for compounds reducing GHS receptor activity is facilitated through the use of a ghrelin analog in the assay. The use of a ghrelin analog in a screening assay provides for GHS receptor activity. The effect of test compounds on such activity can be measured to identify, for example, allosteric modulators and antagonists.

GHS receptor activity can be measured using different techniques such as detecting a change in the intracellular conformation of the GHS receptor, in the G-protein coupled activities, and/or in the intracellular messengers. Preferably, GHS receptor activity is measured using techniques such as those measuring intracellular Ca²⁺ Examples of techniques well known in the art that can be employed to measure Ca²⁺ include the use of dyes such as Fura-2 and the use of Ca²⁺-bioluminescent sensitive reporter proteins such as aequorin. An example of a cell line employing aequorin to measure G-protein activity is HEK293/aeq17 (Button, D. et al., Cell Calcium, (1993), 14(9):663-71; and Feighner, S. D. et al., Science, (1999), 284(5423):2184-8).

Chimeric receptors containing a ghrelin binding region functionally coupled to a different G-protein can also be used to measure GHS receptor activity. A chimeric GHS receptor contains an N-terminal extracellular domain; a transmembrane domain made up of transmembrane regions, extracellular loop regions, and intracellular loop regions; and an intracellular carboxy terminus. Techniques for producing chimeric receptors and measuring G-protein coupled responses are provided in, for example, International Application Number WO 97/05252, and U.S. Pat. No. 5,264,565, both of which are hereby incorporated by reference herein.

Ghrelin analogs can be used to stimulate GHS receptor activity. Such stimulation can be used, for example, to study the effect of GHS receptor modulation, to study the effect of growth hormone secretion, to look for or study ghrelin antagonists, or to achieve a beneficial effect in a subject. It is contemplated that the ghrelin analogs of the instant invention are useful for stimulating gastrointestinal motility.

B.1.a. Preparation of CHO-K1 Cells Expressing the Human Recombinant GHS Receptor

The cDNA for human growth hormone secretagogue receptor (hGHS-R, or ghrelin receptor) was cloned by Polymerase Chain Reaction (PCR) using human brain RNA as a template (Clontech, -Palo Alto, Calif.), gene specific primers flanking the full-length coding sequence of hGHS-R, (S: 5′-A T G T G G A A C G C G A C G C C C A G C G A A G A G-3′ and AS: 5′-T C A T G T A T T A A T A C T A G A T T C T G T C C A-3′), and Advantage 2 PCR Kit (Clontech, -Palo Alto, Calif.). The PCR product was cloned into the pCR2.1® vector using Original TA® Cloning Kit (Invitrogen, Carlsbad, Calif.). The full length human GHS-R was subcloned into the mammalian expression vector pcDNA 3.1® (Invitrogen, Carlsbad, Calif.). The plasmid was transfected into the Chinese hamster ovary cell line, CHO-K1 (American Type Culture Collection, Rockville, Md.) by calcium phosphate method (Wigler, M. et al., Cell, (1977), 11(1):223-32). Single cell clones stably expressing the hGHS-R were obtained by selecting transfected cells grown in cloning rings in RPMI 1640 media supplemented with 10% fetal bovine serum and 1 mM sodium pyruvate containing 0.8 mg/ml G418 (Gibco®, Grand Island, N.Y., U.S.A.).

B.1.b GHS-Receptor Binding Assay:

Membranes for radioligand binding studies can be and were prepared by homogenization of the foregoing CHO-K1 cells expressing the human recombinant GHS receptor. The cells were homogenized in 20 ml of ice-cold 50 mM Tris-HCl using a Brinkman Polytron® (Westbury, N.Y.; setting 6, 15 sec). The homogenates were washed twice by centrifugation (39,000 g/10 min) and the final pellets were resuspended in 50 mM Tris-HCl containing 2.5 mM MgCl₂ and 0.1% bovine serum albumin (BSA). For the assay, 0.4 ml aliquots were incubated with 0.05 nM (¹²⁵I)ghrelin (˜2000 Ci/mmol, Perkin Elmer Life Sciences, Boston, Mass.) with and without 0.05 ml of unlabeled competing test peptide. After a 60 min incubation at 4° C., the bound (¹²⁵I)ghrelin was separated from free (¹²⁵I)ghrelin by rapid filtration through GF/C filters (Brandel, Gaithersburg, Md.) which had been previously soaked in 0.5% polyethyleneimine/0.1% BSA. The filters were then washed three times with 5-ml aliquots of ice-cold 50 mM Tris-HCl and 0.1% BSA, and the bound radioactivity trapped on the filters was counted by gamma spectrometry (Wallac LKB, Gaithersburg, Md.). Specific binding was defined as the total (¹²⁵I)ghrelin bound minus that bound in the presence of 1000 nM ghrelin (Bachem, Torrence, Calif.).

A selection of the preferred embodiments was tested using the receptor binding assay discussed above and the results are reported in Table 1 presented below.

TABLE 1 Receptor Binding Ki Values for Selected Compounds Example # COMPOUND Ki(nM) #1 H-Apc-D-1-Nal-D-Trp-2-Thi-Lys-NH₂; (SEQ ID NO: 124) 0.29 #2 Inp-D-2-Nal-D-Trp-Phe-Lys-NH₂(SEQ ID NO: 111) 0.30 #3 H-Inp-D-1-Nal-D-Trp-2-Thi-Lys-NH₂(SEQ ID NO: 112) 0.31 #4 H-Apc-D-Bal-D-Trp-Phe-Lys-NH₂(SEQ ID NO: 123) 0.32 #5 H-Inp-D-Bal-D-Trp-Phe-Lys-NH₂(SEQ ID NO: 111) 0.33 #6 H-Inp-D-1-Nal-D-Trp-Phe-Apc-NH₂(SEQ ID NO: 122) 0.36 #7 H-Apc-D-Bal-D-Trp-2-Thi-Lys-NH₂(SEQ ID NO: 128) 0.36 #8 (Aib², Glu³(NH-hexyl))hGhrelin(1-28)-NH₂(SEQ ID NO: 84) 0.38 #9 H-Inp-D-Bal-D-Trp-2-Thi-Apc-NH₂(SEQ ID NO: 151) 0.40 #10 (Aib⁸)hGhrelin(1-28)-NH₂(SEQ ID NO: 16) 0.41 #11 H-Apc-D-2-Nal-D-Trp-Phe-Lys-NH₂(SEQ ID NO: 123) 0.42 #12 H-Inp-D-Bal-D-Trp-2-Thi-Lys-NH₂(SEQ ID NO: 121) 0.42 #13 H-Apc-D-1-Nal-D-Trp-Phe-Lys-NH₂(SEQ ID NO: 131) 0.42 #14 H-Apc-D-1-Nal-D-Trp-Taz-Lys-NH₂(SEQ ID NO: 124) 0.45 #15 H-Inp-D-2-Nal-D-Trp-2-Thi-Lys-NH₂(SEQ ID NO: 113) 0.45 #16 (Aib^(2,8), Glu(NH-hexyl)^(3,17))hGhrelin(1-28)-NH₂(SEQ ID 0.45 NO: 202) #17 H-Apc-D-1-Nal-D-Trp-2-Thi-Apc-NH₂(SEQ ID NO: 137) 0.46 #18 H-Apc-D-1-Nal-D-Trp-Phe-Apc-NH₂(SEQ ID NO: 129) 0.46 #19 H-Inp-D-Bal-D-Trp-Phe-Apc-NH₂(SEQ ID NO: 122) 0.47 #20 H-Apc-D-Bal-D-Trp-Taz-Lys-NH₂(SEQ ID NO: 128) 0.50 #21 (Glu³(O-hexyl))hGhrelin(1-28)-NH₂(SEQ ID NO: 1) 0.50 #22 H-Apc-D-Bal-D-Trp-2-Thi-Apc-NH₂(SEQ ID NO: 143) 0.51 #23 H-Inp-D-Bal-D-Trp-Taz-Lys-NH₂;(SEQ ID NO: 121) 0.52 #24 H-Inp-D-1-Nal-D-Trp-2-Thi-Apc-NH₂(SEQ ID NO: 147) 0.53 #25 (Aib²)hGhrelin(1-28)-NH₂(SEQ ID NO: 10) 0.57 rGhrelin 0.59 #26 (2-Thi⁹)hGhrelin(1-28)-NH₂(SEQ ID NO: 14) 0.63 #27 (Aib², Taz⁹)hGhrelin(1-28)-NH₂(SEQ ID NO: 8) 0.63 #28 H-Inp-D-2-Nal-D-Trp-Phe-Apc-NH₂(SEQ ID NO: 122) 0.64 #29 (Aib², 3-Pal⁹)hGhrelin(1-28)-NH₂(SEQ ID NO: 8) 0.65 #30 H-Apc-D-Bal-D-2-Nal-Phe-Lys-NH₂(SEQ ID NO: 132) 0.68 #31 H-Apc-D-1-Nal-D-Trp-Phe-NH₂(SEQ ID NO: 125) 0.70 #32 (3-Pal⁹)hGhrelin(1-28)-NH₂(SEQ ID NO: 14) 0.70 #33 H-Apc-D-Bal-D-Trp-Phe-Apc-NH₂(SEQ ID NO: 130) 0.71 #34 H-Apc-D-1-Nal-D-Trp-2-Thi-NH₂(SEQ ID NO: 133) 0.73 #35 (Glu³(NH-Hexyl), Aib⁸)hGhrelin(1-28)-NH₂(SEQ ID NO: 35) 0.74 #36 (Aib², 4-Hyp⁷)hGhrelin(1-28)-NH₂(SEQ ID NO: 9) 0.75 #37 H-Inp-D-2-Nal-D-Trp-Taz-Lys-NH₂(SEQ ID NO: 113) 0.80 #38 H-Inp-D-Bal-D-Trp-Taz-Apc-NH₂(SEQ ID NO: 135) 0.83 #39 H-Inp-D-1-Nal-D-Trp-2-Thi-NH₂(SEQ ID NO: 116) 0.87 #40 (Asp³(O-hexyl))hGhrelin(1-28)-NH₂(SEQ ID NO: 326) 0.88 #41 H-Apc-D-Bal-D-Trp-Phe-NH₂(SEQ ID NO: 125) 0.89 #42 (Lys⁵)hGhrelin(1-28)-NH₂(SEQ ID NO: 3) 0.89 #43 (Aib², Glu³(NH-hexyl), Taz⁹)hGhrelin(1-28)-NH₂(SEQ ID 0.90 NO: 64) #44 (Aib², Dhp⁷)hGhrelin(1-28)-NH₂(SEQ ID NO: 9) 0.91 #45 H-Apc-D-2-Nal-D-Trp-2-Thi-NH₂(SEQ ID NO: 134) 0.95 #46 H-Apc-D-1-Nal-D-Trp-Taz-Apc-NH₂(SEQ ID NO: 136) 0.98 #47 H-Apc-D-Bal-D-Trp-2-Thi-NH₂(SEQ ID NO: 144) 0.98 #48 (Aib^(2,10))hGhrelin(1-28)-NH₂(SEQ ID NO: 12) 1.02 #49 (Aib^(2,8))hGhrelin(1-28)-NH₂(SEQ ID NO: 11) 1.02 #50 H-Inp-D-1-Nal-D-Trp-3-Pal-Lys-NH₂(SEQ ID NO: 112) 1.05 #51 (Aib², Glu³(NH-hexyl), 2-Thi⁹)hGhrelin(1-28)-NH₂(SEQ ID 1.06 NO: 64) #52 (A5c²)hGhrelin(1-28)-NH₂(SEQ ID NO: 10) 1.07 #53 (Aib², Tic⁷)hGhrelin(1-28)-NH₂(SEQ ID NO: 9) 1.08 #54 (Aib², Thz⁷)hGhrelin(1-28)-NH₂(SEQ ID NO: 9) 1.08 #55 (Aib², 4-Pal⁹)hGhrelin(1-28)-NH₂(SEQ ID NO: 8) 1.09 #56 (Aib^(2,8), Glu³(NH-hexyl))hGhrelin(1-28)-NH₂(SEQ ID NO: 27) 1.09 #57 H-Inp-D-1-Nal-D-Trp-Taz-Lys-NH₂(SEQ ID NO: 112) 1.11 #58 H-Apc-D-Bal-D-Trp-Taz-Apc-NH₂(SEQ ID NO: 136) 1.13 #59 (Aib^(2,10), Glu³(NH-hexyl))hGhrelin(1-28)-NH₂(SEQ ID NO: 28) 1.14 #60 H-Inp-D-1-Nal-D-Trp-Taz-Apc-NH₂(SEQ ID NO: 135) 1.19 #61 Cys³(S(CH₂)₉CH₃)hGhrelin(1-28)-NH₂(SEQ ID NO: 1) 1.24 #62 (Aib¹)hGhrelin(1-28)-NH₂(SEQ ID NO: 329) 1.28 #63 (Ac-Gly¹, Aib²)hGhrelin(1-28)-NH₂(SEQ ID NO: 90) 1.29 #64 H-Apc-D-1-Nal-D-1-Nal-Phe-Lys-NH₂(SEQ ID NO: 131) 1.32 #65 (Aib², Pip⁷)hGhrelin(1-28)-NH₂(SEQ ID NO: 9) 1.34 #66 H-Inp-D-Bip-D-Trp-Phe-Lys-NH₂(SEQ ID NO: 111) 1.35 #67 H-Apc-D-1-Nal-D-Trp-Taz-NH₂(SEQ ID NO: 133) 1.41 #68 H-Apc-D-Bal-D-1-Nal-Phe-Lys-NH₂(SEQ ID NO: 132) 1.46 #69 H-Apc-D-Bal-D-2-Nal-Phe-Apc-NH₂(SEQ ID NO: 130) 1.49 #70 H-Inp-D-2-Nal-D-Trp-Thr(Bzl)-Lys-NH₂(SEQ ID NO: 113) 1.55 #71 H-Inp-D-2-Nal-D-Trp-3-Pal-Lys-NH₂(SEQ ID NO: 113) 1.58 #72 H-Apc-D-Bal-D-Trp-Taz-NH₂(SEQ ID NO: 144) 1.62 #73 H-Apc-D-1-Nal-D-2-Nal-Phe-Apc-NH₂(SEQ ID NO: 129) 1.71 #74 H-Apc-D-1-Nal-D-1-Nal-Phe-Apc-NH₂(SEQ ID NO: 129) 1.99 #75 (Dap³(octanesulfonyl))hGhrelin(1-28)-NH₂(SEQ ID NO: 1) 2.00 #76 (Glu³(NH-hexyl))hGhrelin(1-28)-NH₂(SEQ ID NO: 1) 2.03 #77 H-Apc-D-2-Nal-D-Trp-Taz-NH₂(SEQ ID NO: 134) 2,11 #78 H-Inp-D-Bal-D-Trp-Phe-NH₂(SEQ ID NO: 119) 2.30 #79 (Aib², Glu³(NH-hexyl), 4-Hyp⁷)hGhrelin(1-28)-NH₂(SEQ ID 2.34 NO: 65) #80 (Aib², Glu³(NH-hexyl), 3-Pal⁹)hGhrelin(1-28)-NH₂(SEQ ID 2.35 NO: 64) #81 (Aib², Cha⁵)hGhrelin(1-28)-NH₂(SEQ ID NO: 2) 2.98 #82 (Glu³(NH-hexyl), 4-Hyp⁷)hGhrelin(1-28)-NH₂(SEQ ID NO: 68) 3.36 #83 H-Apc-D-Bal-D-1-Nal-Phe-Apc-NH₂(SEQ ID NO: 130) 3.48 #84 H-Inp-D-2-Nal-D-Trp-2-Thi-NH₂(SEQ ID NO: 115) 4.11 #85 (Aib², Glu³(NH-hexyl), 4-Pal⁹)hGhrelin(1-28)-NH₂(SEQ ID 4.15 NO: 64) #86 (Asp³(NH-heptyl))hGhrelin(1-28)-NH₂(SEQ ID NO: 326) 4.27 #87 H-Inp-D-2-Nal-D-Trp-Thr(Bzl)-NH₂(SEQ ID NO: 115) 4.46 #88 (Aib², Abu⁶)hGhrelin(1-28)-NH₂(SEQ ID NO: 4) 4.60 #89 (Aib^(2,12), Glu³(NH-hexyl), 4-Pal⁹, Orn¹⁵)hGhrelin(1-28)-NH₂(SEQ 4.83 ID NO: 75) #90 H-Inp-D-2-Nal-D-Trp-Taz-NH₂(SEQ ID NO: 115) 6.17 #91 H-Inp-D-2-Nal-D-Trp-4-Pal-Lys-NH₂(SEQ ID NO: 113) 7.35 #92 (n-octanoyl-Gly¹)hGhrelin(1-28)-NH₂(SEQ ID NO: 95) 10.19 #93 H-Inp-D-2-Nal-D-Trp-3-Pal-NH₂(SEQ ID NO: 115) 11.35 #94 (Act²)hGhrelin(1-28)-NH₂(SEQ ID NO: 10) 12.72 #95 (n-butyryl-Gly¹)hGhrelin(1-28)-NH₂(SEQ ID NO: 95) 12.78 #96 (Aib², A6c⁵)hGhrelin(1-28)-NH₂(SEQ ID NO: 2) 14.77 #97 H-Inp-D-1-Nal-D-Trp-3-Pal-NH₂(SEQ ID NO: 116) 16.10 #98 H-Inp-D-Bip-D-Trp-Phe-NH₂(SEQ ID NO: 117) 20.00 #99 (isobutyryl-Gly¹)hGhrelin(1-28)-NH₂(SEQ ID NO: 95) 21.85 hGhrelin(1-28)-NH₂ 24.16 #100 H-Inp-D-2-Nal-D-Trp-Pff-Lys-NH₂(SEQ ID NO: 113) 25.43 #101 H-Inp-D-2-Nal-D-Bal-Phe-NH₂(SEQ ID NO: 118) 27.40 #102 (A6c⁵)hGhrelin(1-28)-NH₂(SEQ ID NO: 3) 35.82 #103 H-Inp-D-2-Nal-D-Trp-Pff-NH₂(SEQ ID NO: 115) 36.31 #104 (des-Ser²)hGhrelin(1-28)-NH₂(SEQ ID NO: 327) 39.10 #105 H-Inp-D-Dip-D-Trp-Phe-Lys-NH₂(SEQ ID NO: 111) 46.78 #106 H-Inp-D-Bal-D-Trp(Ψ)-Pim(SEQ ID NO: 126) 48.73 #107 H-Inp-D-1-Nal-D-Trp(Ψ)-Pim(SEQ ID NO: 126) 50.55 #108 (Aib^(2,6))hGhrelin(1-28)-NH₂(SEQ ID NO: 4) 71.55 #109 H-Inp-D-Bpa-D-Trp-Phe-Lys-NH₂(SEQ ID NO: 111) 93.75 #110 H-Inp-D-2-Nal-D-Dip-Phe-NH₂(SEQ ID NO: 118) 104.80 #111 H-Inp-D-Dip-D-Trp-Phe-NH₂(SEQ ID NO: 117) 104.83 #112 H-Inp-D-2-Nal-D-Trp-4-Pal-NH₂(SEQ ID NO: 115) 113.50 #113 H-Inp-D-2-Nal-D-Trp(Ψ)-Pim(SEQ ID NO: 126) 116.68 #114 Aib², Act⁶)hGhrelin(1-28)-NH₂(SEQ ID NO: 4) 155.43 #115 H-Inp-D-Trp-D-2-Nal(Ψ)-Pim(SEQ ID NO: 120) 182.00 #116 H-Inp-D-2-Nal-D-Trp-Orn-Lys-NH₂(SEQ ID NO: 113) 243.00 #117 (des-Gly¹, des-Ser²)hGhrelin(1-28)-NH₂(SEQ ID NO: 328) 283.33 #118 H-Inp-D-2-Nal-D-Bpa-Phe-Lys-NH₂(SEQ ID NO: 114) 419.00 #119 H-Aib-D-Ser(Bzl)-D-Trp(Ψ)-Pim(SEQ ID NO: 127) 753.33

B.2. GHS-R Functional Activity Assays

B.2.a. In vitro GSH Receptor Mediated Intracellular iCa²⁺ Mobilization

The foregoing CHO-K1 cells expressing the human GSH receptor were harvested by incubation in a 0.3% EDTA/phosphate buffered saline solution (25° C.) and washed twice by centrifugation. The washed cells were resuspended in Hank's—buffered saline solution (HBSS) for loading of the fluorescent Ca²⁺ indicator Fura-2AM. Cell suspensions of approximately 10⁶ cells/ml were incubated with 2 μM Fura-2AM for 30 min at about 25° C. Unloaded Fura-2AM was removed by centrifugation twice in HBBS, and the final suspensions were transferred to a spectrofluorimeter (Hitachi F-2000) equipped with a magnetic stirring mechanism and a temperature-regulated cuvette holder. After equilibration to 37° C., the ghrelin analogs were added for measurement of intracellular Ca²⁺ mobilization. The excitation and emission wavelengths were 340 and 510 nm, respectively.

B.2.b. In Vivo GH Release/Suppression

As is well known in the art, compounds may be tested for their ability to stimulate or suppress release of growth hormone (GH) in vivo (Deghenghi, R. et al., Life Sciences, (1994), 54(18):1321-8; and International Patent Application No. PCT/EP01/07929 [WO 02/08250]). Thus for example in order to ascertain a compound's ability to stimulate GH release in vivo the compound may be injected subcutaneously in 10-day old rats at a dose of, e.g., 300 mg/kg. The circulating GH may be determined at, e.g., 15 minutes after injection and compared to GH levels in rats injected with a solvent control.

B.3. Effect Upon Gastrointestinal Motility

Ghrelin has been shown to increase gastric motility and improve gastric emptying in subjects suffering from gastroparesis. Selected compounds of the invention can be and were tested to determine the effect of the compounds upon gastric emptying and intestinal transit.

B.3.a. In Vivo Study of Ghrelin on Intestinal Transit

The effect of native ghrelin and a peptidyl analog of ghrelin, H-Inp-D-Bal-D-Trp-Phe-Apc-NH₂ (SEQ ID NO:122) (Example 19) on intestinal transit was conducted. In the study, groups of eight rats were fasted for approximately 24 hours with free access to water. Anesthetized test subjects were administered native ghrelin, the selected analog and atropine as a control. The test subjects were administered a 2 ml charcoal meal by esophageal gavage approximately five minutes after the initial administration of ghrelin, the selected analog or atropine. After approximately an additional 25 minutes, the test subjects were sacrificed by cervical rupture and the small intestines were removed. The distance the charcoal traveled was measured from the pylorus. Both ghrelin and the tested peptidyl analog of ghrelin (H-Inp-D-Bal-D-Trp-Phe-Apc-NH₂) (SEQ ID NO:122) accelerated gastric intestinal transit.

B.3.b. In Vivo Study of Ghrelin on Gastric Emptying

Selected compounds of the invention can be and were tested to determine the effect of the compounds upon gastric emptying. The effect of native ghrelin and a peptidyl analog of ghrelin, H-Inp-D-Bal-D-Trp-Phe-Apc-NH₂ (SEQ ID NO:122), on gastric emptying was conducted. In the study, groups of eight male Sprague Dawley rats (weighing 200-250 gms) were fasted for approximately 24 hours with free access to water. Native ghrelin, the selected ghrelin analog and a metoclopramide control compound were administered intravenously to anesthetized test subjects. Approximately five minutes after the initial administration of native ghrelin, the selected ghrelin analog or the control compound, a 1.5 ml meal marked with phenol red (0.5 mg/ml phenol red and 1.5% methyl cellulose in whole milk) was administered to each test subject by esophageal gavage. After approximately an additional 20 minutes, the test subjects were sacrificed by cervical rupture and the stomachs removed and individually pulverized. The residual phenol red in the stomach of the test subjects was extracted and was measured spectrophometrically at a wavelength of 560 nm. Both ghrelin and the tested peptidyl analog of ghrelin (H-Inp-D-Bal-D-Trp-Phe-Apc-NH₂ (SEQ ID NO:122)) accelerated gastric emptying.

In other experiments, groups of eight male Sprague Dawley rats (weighing 200-250 gms) were fasted for approximately 24 hours with free access to water. The animals were injected subcutaneously with either vehicle or varying doses of native ghrelin or selected ghrelin analogs. After approximately 15 minutes, 1.5 ml of a phenol red marked nutrient meal (0.5 mg/ml phenol red & 1.5% methyl cellulose in whole milk) was administered orally to the rats. After an additional approximately 15 minutes, the subjects were sacrificed by cervical rupture and, after clamping the pylorus & cardia, the stomach was removed. The residual phenol red in the stomach was extracted and measured by spectrophotometric methods at a wavelength of 560 nm. Both ghrelin and the tested peptidyl analog of ghrelin (H-Inp-D-Bal-D-Trp-Phe-Apc-NH₂ (SEQ ID NO:122)) accelerated gastric emptying. (see Figures)

B.3.c. Effect on POI in Rat

A 3 centimeter laparotomy was used to induce gastric ileus in male Sprague Dawley rats (weighing 200-250 gms) under isoflurane anesthesia. The abdominal muscles and skin were closed with suture and the animals were allowed to recover for approximately two hours and forty five minutes. At this time, vehicle or selected ghrelin analogs were administered subcutaneously to the laparectomized animals. Approximately 15 minutes after administration of the compounds or vehicle, the phenol red marked meal (see above) was introduced into the animals. After an additional approximately 15 minutes, the subjects were sacrificed by cervical rupture and gastric emptying was measured as described above. Both ghrelin and the tested peptidyl analog of ghrelin (H-Inp-D-Bal-D-Trp-Phe-Apc-NH₂ (SEQ ID NO:122)) significantly accelerated gastric emptying under post-operative ileus conditions.

B.3.d. Effect on POI in Rat in the Presence of Morphine

A 3 centimeter laparotomy was used to induce gastric ileus in male Sprague Dawley rats (weighing 200-250 gms) under isoflurane anesthesia. The abdominal muscles and skin were closed with suture and the animals were allowed to recover for approximately 2.5 hours at which time the laparecotomized animals received a subcutaneous administration of 4 mg/kg morphine. Approximately 15 minutes after receiving the morphine, vehicle or selected ghrelin analogs were administered subcutaneously to the laparectomized animals. Approximately 15 minutes after administration of the compounds or vehicle, the phenol red marked meal (see above) was introduced into the animals. After an additional approximately 15 minutes, the subjects were sacrificed by cervical rupture and gastric emptying was measured as described above. As can be seen in the Figures, ghrelin and its analog significantly accelerate gastric emptying in the presence of morphine and post-operative ileus conditions.

One skilled in the art would know that assays similar to those described herein may be used to determine the effect of a ghrelin analog upon gastric emptying and intestinal transit.

Administration

Ghrelin analogs can be formulated and administered to a subject using the guidance provided herein along with techniques well known in the art. The preferred route of administration ensures that an effective amount of compound reaches the target. Guidelines for pharmaceutical administration in general are provided in, for example, Remington's Pharmaceutical Sciences 18th Edition, Ed. Gennaro, Mack Publishing, 1990, and Modem Pharmaceutics 2^(nd) Edition, Eds. Banker and Rhodes, Marcel Dekker, Inc., 1990, both of which are hereby incorporated by reference herein.

Ghrelin analogs can be prepared as acidic or basic salts. Pharmaceutically acceptable salts (in the form of water- or oil-soluble or dispersible products) include conventional non-toxic salts or the quaternary ammonium salts that are formed, e.g., from inorganic or organic acids or bases. Examples of such salts include acid addition salts such as acetate, adipate, alginate, aspartate, benzoate, benzenesulfonate, bisulfate, butyrate, citrate, camphorate, camphorsulfonate, cyclopentanepropionate, digluconate, dodecylsulfate, ethanesulfonate, fumarate, glucoheptanoate, glycerophosphate, hemisulfate, heptanoate, hexanoate, hydrochloride, hydrobromide, hydroiodide, 2-hydroxyethanesulfonate, lactate, maleate, methanesulfonate, 2-naphthalenesulfonate, nicotinate, oxalate, pamoate, pectinate, persulfate, 3-phenylpropionate, picrate, pivalate, propionate, succinate, tartrate, thiocyanate, tosylate, and undecanoate; and base salts such as ammonium salts, alkali metal salts such as sodium and potassium salts, alkaline earth metal salts such as calcium and magnesium salts, salts with organic bases such as dicyclohexylamine salts, N-methyl-D-glucamine, and salts with amino acids such as arginine and lysine.

Ghrelin analogs can be administered using different routes including oral, nasal, by injection, transdermal, and transmucosally. Active ingredients to be administered orally as a suspension can be prepared according to techniques well known in the art of pharmaceutical formulation and may contain microcrystalline cellulose for imparting bulk, alginic acid or sodium alginate as a suspending agent, methylcellulose as a viscosity enhancer, and sweeteners/flavoring agents. As immediate release tablets, these compositions may contain microcrystalline cellulose, dicalcium phosphate, starch, magnesium stearate and lactose and/or other excipients, binders, extenders, disintegrants, diluents and lubricants.

Administered by nasal aerosol or inhalation formulations may be prepared, for example, as solutions in saline, employing benzyl alcohol or other suitable preservatives, absorption promoters to enhance bioavailability, employing fluorocarbons, and/or employing other solubilizing or dispersing agents.

Ghrelin analogs may also be administered in intravenous (both bolus and infusion), intraperitoneal, subcutaneous, topical with or without occlusion, or intramuscular form. When administered by injection, the injectable solution or suspension may be formulated using suitable non-toxic, parenterally-acceptable diluents or solvents, such as Ringer's solution or isotonic sodium chloride solution, or suitable dispersing or wetting and suspending agents, such as sterile, bland, fixed oils, including synthetic mono- or diglycerides, and fatty acids, including oleic acid.

Suitable dosing regimens are preferably determined taking into account factors well known in the art including type of subject being dosed; age, weight, sex and medical condition of the subject; the route of administration; the renal and hepatic function of the subject; the desired effect; and the particular compound employed.

Optimal precision in achieving concentrations of drug within the range that yields efficacy without toxicity requires a regimen based on the kinetics of the drug's availability to target sites. This involves a consideration of the distribution, equilibrium, and elimination of a drug. The daily dose for a subject is expected to be between 0.01 and 1,000 mg per subject per day.

Ghrelin analogs can be provided in a kit. Such a kit typically contains an active compound in dosage forms for administration. A dosage form contains a sufficient amount of active compound such that a desirable effect can be obtained when administered to a subject during regular intervals, such as 1 to 6 times a day, during the course of 1 or more days. Preferably, a kit contains instructions indicating the use of the dosage form to achieve a desirable affect and the amount of dosage form to be taken over a specified time period.

The invention has been described in an illustrative manner, and it is to be understood that the terminology which has been used is intended to be in the nature of words of description rather than of limitation. Obviously, many modifications and variations of the present invention are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims the invention may be practiced otherwise than as specifically described.

The patent and scientific literature referred to herein represents knowledge that is available to those with skill in the art. All patents, patent publications and other publications cited herein are hereby incorporated by reference in their entirety.

OTHER EMBODIMENTS

The foregoing description has been limited to specific embodiments of this invention. It will be apparent however, that variations and modifications may be made to the invention, with the attainment of some or all of the advantages of the invention. Such embodiments are also within the scope of the following claims. 

1-37. (canceled)
 38. A method of treating a gastrointestinal dysmotility condition selected from the group consisting of gastroparesis, constipation, gastroesophageal reflux disease, ileus, emesis, IBS, and colonic pseudo-obstruction, in a patient in need thereof comprising administering to said patient an effective amount of a compound of formula (II): R¹-A¹-A²-A³-A⁴-A⁵-R²  (II) wherein: A¹ is Aib, Apc or Inp; A² is D-Bal, D-Bip, D-Bpa, D-Dip, D-1-Nal, D-2-Nal, D-Ser(Bzl), or D-Trp; A³ is D-Bal, D-Bip, D-Bpa, D-Dip, D-1-Nal, D-2-Nal, D-Ser(Bzl), or D-Trp; A⁴ is 2-Fua, Orn, 2-Pal, 3-Pal, 4-Pal, Pff, Phe, Pim, Taz, 2-Thi, 3-Thi, Thr(Bzl); A⁵ is Apc, Dab, Dap, Lys, Orn, or deleted; R¹ is hydrogen, (C₁₋₆)alkyl, (C₅₋₁₄)aryl, (C₁₋₆)alkyl(C₅₋₁₄)aryl, (C₃₋₈)cycloakyl, or (C₂₋₁₀)acyl; and R² is OH or NH₂; provided that when A⁵ is Dab, Dap, Lys, or Orn, then: A² is D-Bip, D-Bpa, D-Dip or D-Bal; or A³ is D-Bip, D-Bpa, D-Dip or D-Bal; or A⁴ is 2-Thi, 3-Thi, Taz, 2-Fua, 2-Pal, 3-Pal, 4-Pal, Orn, Thr(Bzl), or Pff; when A⁵ is deleted, then: A³ is D-Bip, D-Bpa, or D-Dip; or A⁴ is 2-Fua, Pff, Taz, or Thr(Bzl); or A¹ is Apc when A² is D-Bip, D-Bpa, D-Dip or D-Bal; or A³ is D-Bip, D-Bpa, D-Dip or D-Bal; or A⁴ is 2-Thi, 3-Thi, Orn, 2-Pal, 3-Pal or 4-Pal; or a pharmaceutically acceptable salt thereof.
 39. The method of claim 38 wherein: A¹ is Apc or H-Inp; A² is D-Bal, D-Bip, D-1-Nal, or D-2-Nal; A³ is D-Bal, D-1-Nal, D-2-Nal, or D-Trp; A⁴ is 3-Pal, 4-Pal, Pff, Phe, Pim, Taz, 2-Thi, or Thr(Bzl); and A⁵ is Apc, Lys, or deleted.
 40. The method of claim 38, wherein said gastrointestinal dysmotility condition is selected from the group consisting of gastroparesis, constipation and emesis.
 41. A method of treating a gastrointestinal dysmotility condition selected from the group consisting of gastroparesis, constipation, gastroesophageal reflux disease, ileus, emesis, IBS, and colonic pseudo-obstruction, in a patient in need thereof comprising administering to said patient an effective amount of a compound selected from the group consisting of: (SEQ ID NO: 122) H-Inp-D-Bal-D-Trp-Phe-Apc-NH₂; (SEQ ID NO: 122) H-Inp-D-2-Nal-D-Trp-Phe-Apc-NH₂; (SEQ ID NO: 151) H-Inp-D-Bal-D-Trp-2-Thi-Apc-NH₂; (SEQ ID NO: 135) H-Inp-D-Bal-D-Trp-Taz-Apc-NH₂; (SEQ ID NO: 137) H-Apc-D-1-Nal-D-Trp-2-Thi-Apc-NH₂; (SEQ ID NO: 133) H-Apc-D-1-Nal-D-Trp-2-Thi-NH₂; (SEQ ID NO: 111) H-Inp-D-Bal-D-Trp-Phe-Lys-NH₂;; (SEQ ID NO: 84) (Aib², Glu³(NH-Hexyl))hGhrelin(1-28)-NH₂;;

and pharmaceutically acceptable salts thereof.
 42. The method of claim 41, wherein said method of treating said gastrointestinal dysmotility condition alleviates or ceases symptoms selected from the group consisting of abdominal nausea, distension, vomiting, obstipation, inability to eat and cramps.
 43. The method of claim 41, wherein said gastrointestinal dysmotility condition is gastroparesis.
 44. The method of claim 43, wherein said gastroparesis is diabetic gastroparesis.
 45. A method of treating diabetic gastroparesis in a patient in need thereof comprising administering to said patient an effective amount of H-Inp-D-Bal-D-Trp-Phe-Apc-NH₂; (SEQ ID NO:122), or a pharmaceutically acceptable salt thereof.
 46. The method according to claim 44 or 45, wherein said patient is experiencing Type I diabetes.
 47. The method according to claim 44 or 45, wherein said patient is experiencing Type II diabetes.
 48. The method of claim 44 or 45, wherein said method of treating diabetic gastroparesis alleviates or ceases symptoms selected from the group consisting of abdominal nausea, distension, vomiting, obstipation, inability to eat and cramps.
 49. The method of claim 41, wherein said gastrointestinal dysmotility condition is constipation.
 50. A method of treating constipation in a patient in need thereof comprising administering to said patient an effective amount of H-Inp-D-Bal-D-Trp-Phe-Apc-NH₂; (SEQ ID NO:122), or a pharmaceutically acceptable salt thereof.
 51. The method of claim 41, wherein said gastrointestinal dysmotility condition is emesis.
 52. A method of treating emesis in a patient in need thereof comprising administering to said patient an effective amount of H-Inp-D-Bal-D-Trp-Phe-Apc-NH₂; (SEQ ID NO:122), or a pharmaceutically acceptable salt thereof.
 53. The method according to claim 51 or 52, wherein said emesis is associated with treatment with an anti-cancer chemotherapeutic agent, pregnancy, bulimia, or anorexia.
 54. The method according to claim 53, wherein said emesis is associated with anorexia.
 55. The method according to claim 53, wherein said emesis is associated with treatment with an anti-cancer chemotherapeutic agent.
 56. The method according to claim 53, wherein said emesis is associated with pregnancy.
 57. The method according to claim 53, wherein said emesis is associated with bulimia.
 58. The method of claim 41, wherein said gastrointestinal dysmotility condition is gastroesophageal reflux disease.
 59. The method of claim 41, wherein said gastrointestinal dysmotility condition is ileus.
 60. The method of claim 59, wherein said ileus is postoperative ileus.
 61. The method of claim 60, wherein said patient is either concurrently being administered or has previously been administered opioid analgesics. 